Cardo-Rider Team 2-way Intercom Between Rider and Passenger. Receive, Initiate and reject calls by voice. Fully-weather protected for all riding conditions, Fits in virtually any motorcycle helmet, and leaves no trace. Even sounding voice conversations even have high-speed, with automatic volume adjustment, easy installs within minutes. Long battery life allows for 7hours of talk-time and about a 1 week of standby. Compatible with all Bluetooth phones.