SMART HJC21B Intercom System Stock Item:Smart HJC21B Black i71 RPHA71 RPHA91 Bluetooth 5.0 HJC ^ Lightweight polycarbonate composite shell

Lightweight polycarbonate composite shell

Its compact volume (thanks to the availability of three outer shell sizes)

upper chest

See Resources below for a downloadable PDF chart

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SMART HJC21B Intercom System Stock Item:Smart HJC21B Black i71 RPHA71 RPHA91 Bluetooth 5.0 HJC ^ Lightweight polycarbonate composite shellThe SMART HJC 21B is the 2nd 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 BT 5. 1 low power system, the 21B offers Bluetooth 4 way intercom functionality, with over 22 hours of talk time. The enhanced sound provides users with an HD speaker, to enrich mid to low pitched sounds. Bluetooth 5. 1 intercom up to 4