The SENA ACS10 Intercom is designed to be used with Arai Quantic, RX-7V and RX-7V Evo helmets.Up to 10 hours talk timeAdvanced noise controlHD Voice enabledBluetooth 4.1Working distance up to 1 mileSupports up to 4 riders2.5 hours charging timeThe SENA ACS10 Intercom is a Bluetooth communication system that is designed to be used with the Arai Quantic, RX7V and RX7V helmets. This discrete headset consists of many cool features like HD Speakers, a microphone, three button control and a battery which are all easily fitted to the helmets above. This headset was designed for the exact interior of these helmets which then allows the perfect fit.This headset provides a high quality sound with Sena's outstanding HD speakers. The speakers in this headset offer a marked increase in bass and audio for music, intercom conversation, phone calls and much more. As well as these speakers, this headset also features Sena's Advanced Noise Control technology which helps to filter out wind and any other