HJC 21B Smart Intercom
The 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.

Applicable for RPHA 2nd Gen Series: 
RPHA 31/ RPHA 71/ RPHA 91 and full face: i71

Call answering and hang-up functions
Built-in FM Radio
Long-lasting power (Up to 13 hours)
Battery Unit and PCB unit
Boom-type which is applicable for modular and JET helmets
Wire-type for full-face helmets
Bluetooth 5.1
Advanced noise control
Intercom 1,600 m
Voice prompt
Universal intercom
HD speakers
Audio multitasking
4-way interco