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call, the music will continue. Some mobile phone models will restart the song from the 
beginning. 

 

 

If a phone is connected to the system as a handsfree device, the other phone can 

connect only as an A2DP source. In this case, the device which is playing music can 
be used as a phone but without the handsfree function. Some phones give you the 
option to choose the connection type. 

 

 

If an iPhone is connected to the GW500 via the dock cable and the music is being 

played from it, the iPhone can manage handsfree calls through Bluetooth. Whilst a call 
is active the music will be stopped. After the call, the music will continue. 

 
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3.

 

Package contents 

 

 

BTA1500 device 

 

Microphone with clip 

 

Jack fixture 

 

User guide

 

 
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4.

 

Car compatibility  

 

 

 

Porsche with PCM 2/2.1 head units, where the ‘Phone’ button exists 

 

Audi with MMI-2 head unit  

 

BMW 1/3/5/6/X5 (non iDrive-4 system)   

 

Check 

www.dension.com

 for updates. 

 
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5.

 

Basic installation 

 

5.1 Installing the BTA1500 

  

For best performance, mount the BTA1500 to a plastic part of the vehicle, or tie it to a 
cable harness away from the car radio chassis or other electronic equipment. Avoid 
installing the BTA1500 near large metal objects. 

 

Mercedes (NTG1 and NTG2)   

- with Audio 20 head unit
- with Comand head unit

Note

The original Phone module and the BTA1500 cannot de used at the same time.

:

 

If you want to use the BTA1500 you have to disconnect the original / factory phone module.

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