The Smart HJC 20B Bluetooth Headset lets you intercom with your riding buddies up to 1 mile apart in open terrain so you can keep in touch on your two wheeled escapades. Bluetooth 4.1 technology allows audio multi-tasking to seamlessly blend incoming audio from multiple sources. Audio turning directions from a motorcycle specific GPS or music from a BT enabled smartphone can all be piped into the headset at the same time so you don't miss a turn or a beat. Universal intercom compatibility connects to other brands of headsets. The SMART HJC 20B is designed to seamlessly integrate with the RPHA 11 Pro Carbon, RPHA 90S Carbon, RPHA 70 Carbon, F70, i10 and i90 helmets.Features: Talk time: 10 hours Operating temperature: -10°C - 55°C (14°F - 131°F) Working distance: up to 1.2 km (0.8 miles) in open terrain Audio Overlay: listen to music and use intercom simultaneously Includes both wired and boom microphones Bluetooth: Headset Profile (HSP) Hands-Free Profile (HFP) Advanced Audio Distribution Profile (A2DP) Audio Video Remote Control Profile (AVRCP) Bluetooth 4.1 Audio: Advanced Noise Control Wide volume control Sample rate: max. 48 kHz (DAC) FM Radio: Built-in FM radio with RDS AF (Radio Data System Alternate Frequencies) Radio frequency specifications: 76 - 108MHz Radio region: worldwide Battery: Type: Lithium polymer Device can charge while in use The HJC Smart 20B Bluetooth Headset by Sena is designed to integrate with the following HJC helmets: RPHA 11 Pro Carbon RPHA 70 ST Carbon RPHA 90S Carbon RPHA 90S F70 i10 i30 i90 V90