Motorola Bluetooth HF850 Car Kit In-car connection automatically links and unit turns on/off with ignition Car&#39 s audio system automatically mutes for incoming calls (on most cars) Control buttons to answer/end calls, adjust volume, mute microphone or access voice tags Digital Signal Processing (DSP) enhances the incoming voice and removes impurities from the audio signal Compliant with up to 4 Bluetooth v1.1 devices