Frequently Asked Questions

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GPS Products > General GPS

Q1. Why does the GPS positioning fail even though the satellite signals seems to appear normal in my PDA?
The reason might be that the GPS system has not been used for a while and it needs to be reboot. Follow steps below to reset positioning under the "Visual GPS(ver3.0)" application utility.

Connect to GPS->Connect using Serial Port->Set the "Com Port" and "baud rate"->Click "OK"

Q2. Under what circumstances does the "cold start" procedure being undertaken?
If the time duration for a proper positioning is longer than two weeks or the distance of positioning is greater than 500 km away from previous location, then the "cold start" procedure is undertaken.

Q3. Why does the position of the car drift around even when my PDA is properly positioned?
This might be caused by the unstable satellite signals. Weak signals usually resulted from allocation in heavily blocked areas which will affect the positioning of the car in the map.

Q4. Why is there no sign of signal transmission in map utility program? And the positioning fails even though the GPS system is properly connected?
This might be caused by the incorrect COM Port settings. Most of the PDA map utility programs do search for the GPS device. But in this case the GPS device is not found. It is suggested that you manually adjust the COM Port settings instead.

Q5. Why I can't get the positioning to work with my GPS at home or areas by the windows?
GPS is really used for outdoor positioning navigation, and the satellite signal is difficult to be received at home. Especially, it takes a while to get the positioning to work for the very first time. Therefore, positioning must be done outdoor where satellite signal can be received.

Q6. What "Baud Rate" of QSTARZ GPS Receiver products will be set each?

• BT GPS Receiver:

BT-Q770: Baud Rate 38400
BT-Q775: Baud Rate 9600
BT-Q780: Baud Rate 9600
BT-Q790: Baud Rate 9600
BT-Q800: Baud Rate 115200
BT-Q880: Baud Rate 9600
BT-Q910: Baud Rate 38400
• GPS Mouse:

GM-Q772: Baud Rate 4800
GM-Q774: Baud Rate 9600
GM-Q778: Baud Rate 9600
• CF Card GPS:

GC-Q776: Baud Rate 4800

Q7. The satellite is orbiting in the outer space. Its signals are not as strong as the mobile phone, or radio. Before you start to use our GPS product, pls follow below notice when using it.

1. It's better to use the GPS outdoor with wide space. GPS receiver could not calculate the position though the satellite signals if there are many tall buildings, metal stuff, and heavy forest around your GPS.
2. Do not use the GPS under this kind of environment with the strong electric wave (around 1.57GHz). It's hard to calculate the position at this kind of environment, especially under the high tension tower.
3. The "GPS-Alt" GPS calculate is different from an elevation (above sea level), because they are based on different standards. Please notes this when you use the GPS.

GPS Products > Bluetooth GPS Receiver

Q1. What kind of environment can I use with my Bluetooth GPS Receiver?

1. Outdoor is a must.
2. With good satellite signal for the first time using the Bluetooth GPS Receiver -- such as good weather, in wide open space without many tall buildings.

Q2. Why can't my PDA or other handheld devices do the navigation with my Bluetooth GPS Receiver?

1. Pls make sure you are under outdoors and wide open space to use Bluetooth GPS.
2. Pls make sure your PDA/smart phone and Bluetooth GPS Receiver is connected and paired properly.
3. Pls check if your Bluetooth GPS Receiver's LED indication is displayed correctly.
4. Pls make sure your navigation software's Bluetooth function is on.
5. If above examination can't solve your question, try to re-start your PDA/smart phone and repeat point 2 and point 4.

Q3. Why can't my PDA or handheld device recognize Bluetooth GPS Receiver?

1. Pls make sure to power on your Bluetooth GPS Receiver by long pressing the Power button.
2. Pls make sure your PDA's Bluetooth function is on and Bluetooth setting is correct.
3. Pls make sure your navigation software (such as TomTom..ex) is installed properly and set up correctly.

Q4. How shall I get the driver to install my Bluetooth GPS Receiver?
There is no need to install driver for Bluetooth GPS. It's using Bluetooth wireless connection between your handheld device and Bluetooth GPS Receiver. Just turn on both device and build up Bluetooth connection each other.

Q5. How to setup the com port for my PDA / Window mobile?

Brand	Model	Com port
Compaq	iPAQ 3870 / 3970	Bluetooth Serial Port COM 8
Dell	Axim X3 / X3i / X30	Bluetooth Serial Port COM 7
Dell	Axim X50 / X50i / X50v	Bluetooth Serial Port COM 7
HP	iPAQ 1940 / 1945 (ROM version 1.00)	Bluetooth Serial Port COM 5
HP	iPAQ 1940 / 1945 (ROM version 1.10)	Bluetooth Serial Port COM 8
HP	iPAQ hx2110	Bluetooth Serial Port COM 8
HP	iPAQ 2210 / 2215	Bluetooth Serial Port COM 8
HP	iPAQ hx2410 / 2450 / 2490 / 2750	Bluetooth Serial Port COM 8
HP	iPAQ rx3115 / 3715	Bluetooth Serial Port COM 6
HP	iPAQ 4150 / 4155	Bluetooth Serial Port COM 6
HP	iPAQ 4350	Bluetooth Serial Port COM 8
HP	iPAQ hx4700	Bluetooth Serial Port COM 8
HP	iPAQ 5xxx	Bluetooth Serial Port COM 8
HP	iPAQ 63xx	Bluetooth Serial Port COM 7
i-mate	PDA2k	Bluetooth Serial Port COM 6
i-mate	JAM	Bluetooth Serial Port COM 6
Orange	SPV C500	Bluetooth Serial Port COM 6
Orange	SPV C600	Bluetooth Serial Port COM 6
Orange	SPV M1000	BT on COM 6
Orange	SPV M2000	Bluetooth Serial Port COM 6
Orange	SPV M500	Bluetooth Serial Port COM 6
Orange	SPV M5000	Bluetooth Serial Port COM 6
O2	XDA II	BT on COM 6
O2	XDA IIi / XDA IIs	Bluetooth Serial Port COM 6
O2	XDA Exec	Bluetooth Serial Port COM 6
Proximus	QTEK 2020	BT on COM 6
Proximus	QTEK 9090 / QTEK S100	Bluetooth Serial Port COM 6
T-Mobile	MDA II	BT on COM 6
T-Mobile	MDA III / MDA compact	Bluetooth Serial Port COM 6
T-Mobile	MDA Vario	Bluetooth Serial Port COM 6
Vodafone	VPA III / VPA Compact	Bluetooth Serial Port COM 6

Q6.Why would Nokia smartphone show the message “Unable to pair devices” when pair with BT-Q810?
Due to the quick time out between Nokia smartphone and GPS receiver, your phone would show the message “unable to pair devices”. Actually, it already completed the pair with BT-Q810. So you can ignore the msg. when you start your navigation software, it would establish the Bluetooth connection automatically and start to navigate.

Q7.Why would Nokia N73/E50 interrupt the Bluetooth connection when navigate with BT-Q818/BT-Q810?
Qstarz BT-Q818/BT-Q810 is featured with Auto On-Off function (Sleeping mode) for power saving. However Nokia N73/E50 does not support Sleeping mode, so it would interrupt the Bluetooth connection when pairing with Qstarz BT-Q818/BT-Q810 GPS receiver. Nokia N73 already released new firmware V3.0649 to solve this issue. Before using Nokia N73 with BT-Q818/BT-Q810, please consult Nokia service center for latest firmware update. However Nokia E50's latest firmware hadn't resolved this issue. Qstarz will take this as first priority to work on it and announce the positive result soon.


GPS Products > Bluetooth GPS Receiver > BT-Q770

Q1. How can I know my BT-Q770 BT GPS's status via the LED indication?

1. Bluetooth LED: (for making connection with PDA/smart phone)
   1. Blue light is flashing every 3 seconds means the you are failed to make connection between PDA/smart phone and BT GPS receiver.
   2. Blue light is flashing every 1 second means the Bluetooth connection with PDA/smart phone is established completely.
2. Satellite LED: (for positioning and battery indication)
   1. Red light steady on means GPS tracking function has been activated.
   2. Red light is flashing continuously means your PDA/smart phone have received enough satellite data from Bluetooth GPS, then you can start to do the navigation.
   3. When BT GPS receiver is under charging mode: Green light is steady on means battery is fully charged; Orange light is on means your Bluetooth GPS receiver is being charged for battery.
   4. Green light is flashing means battery power is low.

Q2. How can I use the testing program to test my Bluetooth GPS Receiver function is worked or not?
Pls get the testing program attached in the CD or Qstarz website. There are two kinds of testing programs. One is for testing on Windows CE OS, and the other is for testing on PC Windows OS.

1. BtGpsTester_for Win CE OS:
   ***Pls make sure your PDA and BT-Q770 is connected and paired properly.
   1. Unzip the "BtGpsCe for Win CE.rar" and save the "BtGpsCe.exe" file to your Pocket PC.
   2. Execute "BtGpsCe.exe"
   3. Set the COM port your PDA assigned, ex. COM8, and press "Open" to run this program (To get the COM port your PDA assign, long press the icon of "BT_GPS: SPP slave" to get assigned COM port, typically it is COM 8).
   4. Then you can test the BT-Q770 hardware is worked or not by checking the how many satellite quantity is received and also the strength of satellite signal each.
2. Bluetooth NctLite_for PC Windows:
   ***Pls make sure your PC have Bluetooth function or have Bluetooth adaptor to enable Bluetooth function. And make Bluetooth connection ready between BT-Q770 and Bluetooth enabled PC.
   1. Unzip the ¡§Bluetooth NctLite_for PC.rar¡¨ and execute the program.
   2. Press the "COM" button and you can select correct COM Port and Baud rate. The COM port is assigned from your Bluetooth dongle to give a COM port to your BT-Q770. Then set baud rate at 38400.
   3. Press "OPEN" button then press "Cold Start" to start to see if you can receive satellite quality and the strength.

Q3. How to use my PDA / Window mobile to make a Bluetooth connection for Tom Tom?
Pls firstly make sure the Bluetooth conenction is established between your PDA/smart phone and BT-Q770. After pairing suceeded, you will be found "BT GPS" in your Smart phone/PDA pairing list. Then make it connected.

For Tom Tom 5
1. Select "Change Preference" on the menu. Select "Show GPS status" and then select ‘Configure’ on the bottom right corner. The GPS should be set-up as 'Other Bluetooth GPS' (For some HP PDA, it might require you to set 'Other Cable NMEA GPS', other than "Other Bluetooth GPS"), and then select the Bluetooth COM port. (pls refer to "GPS Products > Bluetooth GPS Receiver > Q5" for the current com port, or double check on your PDA's Bluetooth Manager for Outbound COM port)
2. Back to GPS status screen - check left upper corner. Does it show " No GPS device" or " No Valid GPS signal " ?
If "No GPS device" it means you didn't connect the BT-Q770 with PDA/smart phone right, Pls. will try again Bluetooth connect.
If " No Valid GPS signal" , Pls. will go outdoor and make sure the BT-Q770 with Red LED flashing continuously and this means BT-Q770 can receive GPS signal correctly.
Below is some general information for your reference about BT-Q770.
1. Simple procedure to start up BT-Q770 with your PDA/Smart phone
Long press Power button to power on BT-Q770. (Red LED steady on, Bluetooth LED flashing every 3 seconds) Turn on your Bluetooth function of smart phone/PDA then search new Bluetooth device. You will be found BT GPS and do the pairing. You might be asked to type password 0000 if necessary. After pairing successfully, Blue LED must be flashing every one second. Then you can open your navigation software to check if receiving satellite data from BT-Q770.(If done the receiving data, Red LED flashing continuously, Blue LED flashing every one second) It might take some time around 3~20 min. for positioning depending on your environment.(Pls also refer to the user's guide of navigation software for GPS setting)(If Blue LED isn't flashing every one second, that means the Bluetooth link is disconnected. Pls reconnect it.)
2. BT-Q770 LED indication status for your information:
a. Bluetooth LED: (for making connection with PDA/smart phone)
(1) Blue light is flashing every 3 seconds means the you are failed to make connection between PDA/smart phone and BT GPS receiver.
(2) Blue light is flashing every 1 second means the Bluetooth connection with PDA/smart phone is established completely.
2. Satellite LED: (for positioning and battery indication)
(1) Red light steady on means GPS tracking function has been activated.
(2) Red light is flashing continuously means your PDA/smart phone have received enough satellite data from Bluetooth GPS, then you can start to do the navigation.
(3) When BT GPS receiver is under charging mode: Green light is steady on means battery is fully charged; Orange light is on means your Bluetooth GPS receiver is being charged for battery
(4) Green light is flashing means battery power is low.

3. Notice when using BT-Q770 with your handheld device
1. Pls make sure you are under outdoors and wide open space to use BT-Q770.
2. Pls make sure your PDA/smart phone and Bluetooth GPS Receiver is connected and paired properly.
3. Pls check if your Bluetooth GPS Receiver's LED indication is displayed correctly.
4. Pls make sure your navigation software's Bluetooth function is on.
5. If above examination can't solve your question, try to re-start your PDA/smart phone and repeat point 2 and point 4. Q4. How to use my Smart phone mobile to make a Bluetooth connection for Tom Tom?
Firstly, ensure that the Smartphone and GPS are paired (for instructions on this, get as below).

Nokia Smartphone
Turn on both the GPS and your PDA. Go into the 'Connectivity' screen on your Nokia, select 'Options' and then 'New Paired Device'. Select BT GPS from the list and enter the passkey '0000' (four zero's) when prompted. Once the code has been entered, set the device to 'Authorized'.
The GPS is now paired with the Nokia Smartphone.
For information regarding connecting to your GPS software, select the 'Back' button on your browser to return to the software-specific page.

Sony Ericsson Smartphone

1. In the Application view, tap on CONTROL PANEL, CONNECTIONS tab, BLUETOOTH 2. Tab the SETTING tab and set Bluetooth to ON.
2. Select the DEVICES tab and press ADD
3. The phone stars searching for Bluetooth devices. Make sure that the BT-Q880 is in paring mode.
4. When the BT-Q880 becomes visible in the AVAILABLE DEVICES menu, tap it.
5. Enter the PASSKEY (0000 by default) and press DONE. On the screen, BONDING COMPLETED appears.
6. Tap DONE and BT-Q880 is added to the list of Bluetooth devices and is ready to use.

Once paired, open TomTom Mobile 5 and select 'Change Preferences' from the menu. Select 'Show GPS Status', and then select 'Configure' on the bottom right corner. The GPS should be set-up as 'Other Bluetooth GPS', and then select the Bluetooth port on your mobile device.

For Tomtom, (navigation software in your PDA/smart phone)
Back to GPS status screen - check left upper corner. Does it show " No GPS device" or " No Valid GPS signal " ?
If "No GPS device" it means you didn't connect the BT-Q770 with PDA/smart phone right, Pls. will try again Bluetooth connect.
If " No Valid GPS signal" , Pls. will go outdoor and make sure the BT-Q770 with Red LED flashing continuously and this means BT-Q770 can receive GPS signal correctly.

Simple procedure to start up BT-Q770 with your PDA/Smart phone
Long press Power button to power on BT-Q770. (Red LED steady on, Bluetooth LED flashing every 3 seconds) Turn on your Bluetooth function of smart phone/PDA then search new Bluetooth device. You will be found BT GPS and do the pairing. You might be asked to type password 0000 if necessary. After pairing successfully, Blue LED must be flashing every one second. Then you can open your navigation software to check if receiving satellite data from BT-Q770.(If done the receiving data, Red LED flashing continuously, Blue LED flashing every one second) It might take some time around 3~20 min. for positioning depending on your environment.

BT-Q770 LED indication status for your information:

1. Bluetooth LED: (for making connection with PDA/smart phone)
1. Blue light is flashing every 3 seconds means the you are failed to make connection between PDA/smart phone and BT GPS receiver.
2. Blue light is flashing every 1 second means the Bluetooth connection with PDA/smart phone is established completely.
2. Satellite LED: (for positioning and battery indication)
1. Red light steady on means GPS tracking function has been activated.
2. Red light is flashing continuously means your PDA/smart phone have received enough satellite data from Bluetooth GPS, then you can start to do the navigation.
3. When BT GPS receiver is under charging mode: Green light is steady on means battery is fully charged; Orange light is on means your Bluetooth GPS receiver is being charged for battery
4. Green light is flashing means battery power is low.

GPS Products > Bluetooth GPS Receiver > BT-Q880

Q1. How to use my PDA / Window mobile to make a Bluetooth connection for Tom Tom
Pls firstly make sure the Bluetooth conenction is established between your PDA/smart phone and BT-Q880. After pairing suceeded, you will be found "BT-Q880" in your Smart phone/PDA pairing list. Then make it connected. Then go to your navigation software to activate such as Tomtom to make sure some setting is correct. For first time positioning, it takes longer time around 1~10 min. depends on your environment.

For Tomtom Navigator 5:
1. Select "Change Preference" on the menu. Select "Show GPS status" and then select "Configure" on the bottom right corner. The GPS should be set-up as Other Bluetooth GPS (For some HP PDA, it might require you to set Other Cable NMEA GPS, other than "Other Bluetooth GPS"), and then select the Bluetooth COM port. (pls refer to "GPS Products > Bluetooth GPS Receiver > Q8" for the current com port, or double check on your PDA's Bluetooth Manager for Outbound COM port)
2. Back to GPS status screen - check left upper corner. Does it show "No GPS device" or " No Valid GPS signal " ?
If "No GPS device" it means you didn't connect the BT-Q880 with PDA/smart phone right, Pls. will try again Bluetooth connect.
If "No Valid GPS signal", Pls. will go outdoor and make sure the BT-Q880 with Stellite Green LED is steady on and this means BT-Q880 can receive GPS signal correctly.

Make sure the LED light as below to know it is worked properly:
1. Power LED: Make sure it's On status with Red LED light.
2. Bluetooth LED: When Blue light is steady ON, the Bluetooth link is established between your PDA/smart phone and BT-Q880. When Blue light is flashing, it's under pairing mode.
3. Satellite LED: When Green light is steady ON, you are start to navigate or do positioning. When Green light is flashing, you are not fixed yet.

***If still can't solve your problem, pls try to reset your Bluetooth GPS by taking out the battery for 5 min. to re-put the battery. And delete the paring list from your phone. Then re-do the all the operation procedure. Q2. How to use my Smart phone mobile to make a Bluetooth connection for Tom Tom
Pls firstly make sure the Bluetooth conenction is established between your PDA/smart phone and BT-Q880. After pairing suceeded, you will be found "BT-Q880" in your Smart phone/PDA pairing list. Then make it connected. Go to your navigation software such as Tomtom to make sure setting is correct. For first time positioning, it takes longer time around 1~10 min. depends on your environment. Pls get below more detail operation procedure.

Firstly, ensure that the Smartphone and GPS are paired (for instructions on this, get as below).
Nokia Smartphone
Turn on both the GPS and your PDA. Go into the "Connectivity" screen on your Nokia, select "Options" and then "New Paired Device". Select BT-Q880 from the list and enter the passkey "0000" (four zero's) when prompted. Once the code has been entered, set the device to "Authorized".The GPS is now paired with the Nokia Smartphone.
For information regarding connecting to your GPS software, select the ‘Back’ button on your browser to return to the software-specific page.

Sony Ericsson Smartphone
1. In the Application view, tap on CONTROL PANEL, CONNECTIONS tab, BLUETOOTH 2. Tab the SETTING tab and set Bluetooth to ON.
2. Select the DEVICES tab and press ADD.
3. The phone stars searching for Bluetooth devices. Make sure that the BT-Q880 is in paring mode.
4. When the BT-Q880 becomes visible in the AVAILABLE DEVICES menu, tap it.
5. Enter the PASSKEY (0000 by default) and press DONE. On the screen, BONDING COMPLETED appears.
6. Tap DONE and BT-Q880 is added to the list of Bluetooth devices and is ready to use.

For Tom Tom Mobile 5
1. Once paired, open TomTom Mobile 5 and select "Change Preferences" from the menu. Select "Show GPS Status", and then select "Configure" on the bottom right corner. The GPS should be set-up as "Other Bluetooth GPS", and then select the Bluetooth port on your mobile device.
2. Back to GPS status screen - check left upper corner. Does it show " No GPS device" or " No Valid GPS signal " ?
If "No GPS device" it means you didn't connect the BT-Q880 with PDA/smart phone right, Pls. will try again Bluetooth connect.If " No Valid GPS signal" , Pls. will go outdoor and make sure the BT-Q880 with Stellite Greeen LED is steady on and this means BT-Q880 can receive GPS signal correctly.
***If still can't solve your problem, pls try to reset your Bluetooth GPS by taking out the battery for 5 min. to re-put the battery. And delete the paring list from your phone. Then re-do the all the operation procedure.

Make sure the LED light as below to know it is worked properly:
1. Power LED: Make sure it's On status with Red LED light.
2. Bluetooth LED: When Blue light is steady ON, the Bluetooth link is established between your PDA/smart phone and BT-Q880. When Blue light is flashing, it's under pairing mode.
3. Satellite LED: When Green light is steady ON, you are start to navigate or do positioning. When Green light is flashing, you are not fixed yet.

GPS Products > VisualGPS test program

Q1. Where can I download the Visual GPS with PC version?
Pls go to below website to download:

• http://www.visualgps.net/VisualGPSXP/default.htm

Q2. Where can I download the Visual GPS with Win CE version?
Pls go to below website to download:

• http://www.visualgps.net/VisualGPSce/default.htm

Q3. How can I run the "Visual GPS" program with my PC to test GPS Receiver?
"Visual GPS" will be functioned with a Bluetooth enabled GPS receiver only if the GPS receiver outputs NMEA data.
Please note that each Bluetooth device on the PC may work differently. Some Bluetooth devices require you to establish a connection before applications can access it using the serial port. Make sure that you enable the connection using your Bluetooth dongle's attached software such as Widcomm, Toshiba or BlueSoliel software before using the GPS application. Also take note of the serial port used for the client connection. Typically it is communication port 8. However that could differ.

Q4. I run the "Visual GPS" program but nothing happens. What should I do?
Our products that communicate with a GPS receiver expect to receive NMEA data through a serial communications port. Make sure that the GPS receiver is setup to output NMEA data. Some GPS receivers can communicate in both the NMEA protocol and their own proprietary communication protocol. The standard communication parameters are the port number and baud rate. The port number will vary depending on the drivers and the system.

1. Make sure that the GPS receiver support NMEA output.
2. Make sure that no other programs are accessing the serial port. Since the serial port is a mutual-exclusive device, only one application can access it at any one time.
3. Make sure that the communication settings are as the manufacturer recommends.

Q5. I see data from my GPS Receiver, but none of the controls are worked?
Most GPS receivers output a standard protocol defined by NMEA. This protocol holds information about the position, satellite status and other navigation status. Some GPS receivers send a selective few commands while others have the ability to enable or disable specific NMEA sentences.
Get below supported NMEA sentences:
Our products support a specific set of NMEA sentences from the GPS receiver. They are:

• GGA: Global Positioning System Fix Data - reports time, position and fix related data
• GSA: GNSS DOP and Active Satellites - reports which satellites are being used for navigation and DOP (dilution of precision) values
• GSV: GNSS Satellites in View - reports the signal to noise ratios for each satellite tracked as well as the azimuth and elevation of each satellite
• RMB: Recommended Minimum Navigation Information - Reports cross track error, destination waypoints, range to destination, bearing, etc.
• RMC: Recommended Minimum Specific GNSS Data - Reports position, speed, course over ground and date
• ZDA: Time and Data - reports time and date

Q6. What is NMEA Data?
NMEA (National Marine Electronics Association) data is a standard language most GPS receivers communicate with. It is an ASCII data representation of position, satellite data and other data associated with the GPS receiver. Below is an example of a NMEA sentence:

$GPGGA,060003,3348.784,N,11754.064,W,1,07,1.0,66.2,M,-31.9,M,,*45

This sentence contains the position of N 33' 48.784" latitude, W 117' 54.064" longitude and an altitude of 66.2 meters. The time is showing 06:00:03 UTC.



Bluetooth Products > Bluetooth Stereo Headset

Q1. How do I know that the battery connected to the headset have insufficient power?
The battery power is almost exhausted when one or more following scenarios is happened:

1. The headset starts to reset automatically.
2. You can constantly hear breaks on the audio link.
3. You cannot connect the headset to the transmitter after several trials.

Q2. Why cannot I establish a connection to the headset?

1. Verify that the battery power of headset is not running low.
2. Check if the headset is powered on and the indicator LED of headset lights on.
3. Verify that the headset is within the specified range - 10 meters from the audio source.
4. Check if any other Bluetooth device has connected to the headset. If the headset is connected with other devices, the indicator LED on the headset is constantly on.
5. Turn both the headset and the audio source device off. Power on the headset on and then power on the audio source and try connecting again.

Q3. Why cannot I adjust the volume on the headset?
The volume keys can be only adjusted in the music mode so far. The volume keys have no function in the cell phone mode.