HJC Smart 21B Bluetooth Headset by Sena Lone wolves and road dogs alike can benefit from a Bluetooth headset out on the open road. Thanks to the HJC Smart 21B Bluetooth Headset it's never been easier to listen to music, talk with your road buds, follow GPS or catch a quick phone call while riding. The Smart HJC 21B is designed to seamlessly integrate with the Rpha 91, Rpha 71, Rpha 31, F71, F31, i91 and i71 helmets, so install is a breeze and the aesthetic is undeniably sleek. Features: Power time: Up to 22 hours Working distance: Up to 1.6km (0.9 miles) in open terrain Smart HJC BT App for your phone allows for quick and easy setup and management Smart HJC Device Manager for your PC allows you to upgrade firmware and configure settings Compatible with Sena remote control devices (sold separately) Connectivity: Bluetooth 5.1 Universal intercom compatibility connects to other brands of headsets Pairs with mobile phones, Mp3 players, GPS devices and Sena Sr10 Two-Way Radio Adapter Four-way intercom Music sharing Hands-Free Profile (Hfp) Advanced Audio Distribution Profile (A2Dp) Audio: HD speakers for crisp and clear audio quality Audio multitasking allows you to hear the audio from two features simultaneously Advanced noise control Audio equalizer for dialed in audio preferences HJC Helmet Compatibility: F31 F71 i71 i91 Rpha 31 Rpha 71 Rpha 72 Rpha 91 Includes: Headset main unit Wired boom microphone for modular and open face helmets Microphone sponges for wired boom microphone Wired microphone for full face helmets Hook and loop fastener for wired microphone USB power and data cable Screws Allen wrench