It fits on M1 helmets of the brand they already own earphones and the built-in microphones. With the EC approval with his helmet M1. Compatible with other intercoms SRC System and Cardo. It works easily with 3 buttons: on / off + phone, and adjusting the volume. 2 bluetooth parallel connections: phone + GPS. Intercom: from driver to passenger or driver to driver with a flow that goes up to 500 meters. System Plug and Play. Autonomy of 8 hours talk time and 7 days standby. It recharges in 3 h. The kit is designed to equip a helmet.