SMART HJC 21B is the second generation standard Bluetooth communication system model that supports 21B-compatible HJC helmets, with structural interfaces that users can easily mount on HJC helmets. Based on the low-power BT 5.1 system, the 21B offers 4-way Bluetooth intercom functionality, with over 22 hours of talk time. The improved audio offers users an HD speaker, to enrich mid-bass sounds.
