The Sena ACS10 is a Bluetooth 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. The ASC10 was designed for the exact interior recesses of the Contour-X, allowing for the perfect fit. The ACS10 provides high quality sound with SenaÆs outstanding HD speakers. The HD speakers offer a marked increase in bass and audio clarity for music, intercom conversation, phone calls and more. In addition to HD Speakers the ACS10 also features SenaÆs Advanced Noise ControlÖ technology, which filters out wind and white noise in order to deliver crystal clear audio The ACS10 allows for four-way Bluetooth intercom with a working distance up to 1.6 km (1.0 mi). Riders can also pair their smartphone in order to hear turn-by-turn GPS directions, listen to music, or even take a call...all from within their Arai Contour-X helmet Link the ACS10 with the Sena Utility app to control many of the deviceÆs functions from your fingertips General Operating temperature: -10?C û 55?C (14?F û 131?F) Talk time: up to 10 hours Charging temperature: 0?C û 45?C (32?F û 113?F) Main module: 77 mm x 68 mm x 58 mm (3" x 2-11/16" x 2-5/16") Wired Microphone: length 200 mm Wire between speakers: length 100 mm Speaker driver unit: 40 mm û thickness 7.2 mm Intercom Working distance: up to 1.6 kilometers (1.0 mile) in open terrain Supports up to 4 riders Battery Talk time: 10 hours Charging Time: 2.5 hours 2 built-in 300 mAh lithium polymer battery. SENA ACS10 ARAI CONTOUR-X