This Vantrue bluetooth SOS button is a handy addition to your Vantrue Nexus 4 or Nexus 5 Pro. Place the button anywhere in the car where you can easily access it. With one press of the button you can take a snapshot and start SOS recording or turn the microphone on and off. This SOS button is included with the Vantrue E1 (except the Lite version), E2 and E3