The Sena ACS10 is a made with Bluetooth technology communication system designed specifically for the Arai Contour-X motorcycle helmet. The discrete ACS10 headset consists of HD Speakers, a microphone, three-button control, and a battery, which are easily installed into the helmet. Designed for the exact interior recesses of the Contour-X, allowing for the perfect fit. The ACS10 provides high quality sound with Sena's outstanding HD speakers. The HD speakers offer a marked increase in bass and audio clarity for music, intercom conversation, phone calls and more.