The HJC Smart 11B is a Bluetooth communication system with an all-in-one design that fully integrates into the HJC helmets without adding bulk or weight. It has a control unit with powers on/off and is used for call answering/hanging up. It can control the unit. The main unit has long-lasting power (up to 22 hours). It utilises Bluetooth 5.1 technology with advanced noise control, voice prompt and audio multitasking. It works as a two-way intercom and has an HD speaker. Use the HJC Smartphone mobile app to easily control this Smart HJC comms system. The SMART HJC 2nd generation also comes equipped with HD speakers to enrich mid-to low-pitched sounds. Suitable for the following HJC helmets: RPHA 71 & RPHA 71 CARBON, RPHA 91 & RPHA 91 CARBON, RPHA 31, F71 & F71 CARBON, F31, i71 and the i91.