The SENA 10S Motorcycle Bluetooth Communication System is the upgraded version of SENA's flagship Bluetooth headset for Motorcycle helmets, the SMH10.Bluetooth 2.1 enabledIntercom for 1.5km / 1.0mi radiusFour-way intercom systemHD VoiceAudio multitaskingNoise Cancellation with Advanced Noise ControlVoice prompts12 hours talk timeVersatile Jog Dial3 hour charge time for Lithium Polymer Battery FM RadioCE, FCC and IC certificationThe SENA 10S Motorcycle Bluetooth Communication System allows you to have conversations with up to three others via HD Voice Audio. The other users can be up to 1.6 / 1.0mi away during this time. If members of the group are using a different brand of Intercom, there is no problem with comms as this system is universal.This Headset is Bluetooth 2.1 enabled, and delivers HD-quality audio allowing riders to listen to music/the radio, GPS and make or take calls. SENA's Advanced Noise Control has been included so that wind noise doesn t interfere with incoming or out