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HJC Smart 21B Communication System Single Pack

Average rating of 4.2 out of 5 stars

(7)
Description

HJC Smart 21B Communication System Single Pack

The SMART HJC 21B is the standard 2nd generation Bluetooth communication system that supports 21B compatible HJC helmets and has structural interfaces that users can easily attach to HJC helmets. Based on the BT 5.1 low-power system, the 21B offers a 4-way Bluetooth intercom function with a talk time of over 22 hours. The enhanced sound provides users with an HD speaker that enriches mid to low tones.

Features:

  • The 2nd generation SMART HJC premium Bluetooth communication system models feature an all-in-one design that is fully integrated into the helmet
  • Developed together with SENA and tailored specifically for HJC helmets.
  • With the smartphone app, you can quickly and easily control various functions of the SMART HJC communication system and also view the Quick Start Guide

Specifications:

  • 4-way intercom
  • Universal intercom with a range of up to 1.6 Km (on open terrain)
  • Audio Multitasking™
  • Customized helmet fit
  • HD speakers
  • Audio Multitasking

Bluetooth:

  • Bluetooth® 5.1

Control Unit:

  • Power on/off, call answer/hang up, volume +/-

Main unit:

  • Long lasting power (up to 13 hours)
  • Battery unit & PCB unit

Mic Set:

  • Boom type: Applicable for Modular & JET helmets
  • Wire type: Applicable for Integral helmets

Compatible with:

  • RPHA 31
  • RPHA 71
  • RPHA 91
  • i71

Contents:

  • 1x Headset main unit
  • 1x Wired boom microphone for modular/open helmets
  • 2x Microphone attachments for wired boom microphone
  • 1x Wired microphone for full-face helmets
  • 1x Velcro fastener for fixing the wired microphone
  • 2x Screws
  • 1x USB charging and data cable (USB-C)
  • 1x Hexagon sockets key
Color: black
Size: One size
Sport: Motorcycle
Gender: Men

Reviews

7 out of 7 ratings

Average rating of 4.2 out of 5 stars


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1 - 5 out of 7 reviews

5 November 2025 02:04

Rated 5 out of 5 stars

Good battery life

Use it with my RPHA91 carbon lid. I wear Jabra Elite 10 buds without ANC to mute wind noise when riding with chin bar flipped up.

22 September 2025 09:07

Rated 5 out of 5 stars

Seamless integration with my RPHA91 Carbon

I still need ear plugs to filter out noise when using these. Otherwise all good.

23 April 2025 12:31

Rated 4 out of 5 stars

Вполне неплохая гарнитура

Поставил в HJC RPHA 71 в штатные места. И сначала звук абсолютно не понравился. Совсем не было низких частот, уровень громкости приходилось делать близко к максимуму. Однако потом понял, что динамики находятся далеко от ушей. Динамики снял и подложил в штатные места пластиковую заглушку, которая была в комплекте в шлеме. И на эту заглушку уже наклеил динамики. Всё сразу поменялось. Звук пришел в норму. Управление удобное, но я всё-таки привык к своей Sena 10, там более интуитивно понятное управление.

14 August 2024 07:58

Rated 4 out of 5 stars

Einfache Montage. Passgenau,

Das kommunikations system läst sich ohne Probleme leicht verbauen. Die Lautsprecher könnten ein wenig lauter sein da der Helm eben doch starke Windgeräusche bereits ab niedrigen Geschwindigkeiten erzeugt. Die Sprachverstellung in Deutsch habe ich nicht hinbekommen. Vielleicht geht's auch gar nicht. Tadellose Gesprächs Annahme vom Tel und Gesprächsführung sind möglich.

17 May 2024 05:58

Rated 3 out of 5 stars

Gut

Gute Qualität, Einbau problemlos, optimaler Sitz und Passgenauigkeit im Helm. Lautsprecherqualität könnte bei dem Preis besser sein.

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