Communication system for groups of up to 4 riders, Bluetooth allows you to make hands-free calls, listen to your favorite music (stereo) and GPS navigation instructions, easy-to-use 3-button control, best sound quality in its class, allows for connection of as many as 2 smartphones and GPS navigation system at the same time, allows up to 7 hours of calls, can last up to 7 days in standby mode, resistant to splashing water.