Supports mobile phone based voice commands Complies with all hands-free laws Plug-n-Play installation using cigarette lighter adapter cable Compatible with Bluetooth mobile phones Built-in loudspeaker Noise cancelling microphone DSP technology for noise and echo cancellation Accommodates up to 8 different Bluetooth mobile phone pairings 2-Year Limited Warranty Dimensions (without cup holder insert): 3 x 3 x 2 1/2 (inch) Dimensions (with cup holder insert): 3 x 3 x 5 (inch)