• Bluetooth 5.1 with 4-Way Intercom: The SMART HJC 21B is built on Bluetooth 5.1 and supports up to 4-way intercom with a range of approximately 2 km (1.2 miles) in open terrain.
• HD Speaker for Enriched Audio: Equipped with a high-definition speaker tuned to enrich mid-to-low frequency sounds for a noticeably improved audio experience during riding.
• Up to 22 Hours Talk Time: Industry-leading battery performance with up to 22 hours of intercom talk time for long-distance touring without recharging mid-ride.
• Advanced Noise Control: Sena's Advanced Noise Control reduces ambient wind and road noise for clear communication during phone calls and intercom conversations.
• FM Radio and Smartphone Connectivity: Built-in FM radio plus Bluetooth connectivity for music streaming, GPS navigation, and phone calls from your smartphone.
• Single Control Unit: The 21B features a single control unit mounted on the left side of the helmet for streamlined everyday operation.
• Compatible HJC Helmets: Compatible with HJC RPHA 71, RPHA 91, RPHA 31, i71, i91, F71, and F31 helmets. Co-developed by Sena and HJC for optimal integration.

For HJC helmet riders who want a premium integrated communication system without the complexity of two control units, the SMART HJC 21B hits the sweet spot. Built on Bluetooth 5.1 in partnership between Sena and HJC, the 21B drops seamlessly into compatible HJC helmets with virtually no visible external presence — no clamps, no external housing, just clean integration. Four-way Bluetooth intercom with up to 2 km of range covers most group riding scenarios, and the HD speaker delivers richer, fuller audio than standard communicator speakers. With up to 22 hours of talk time, the 21B handles the longest riding days without needing a charge. FM radio, music streaming, GPS navigation, and phone calls round out a fully-featured system in a single, elegant package. At The Helmet Shop, the SMART HJC 21B is our recommendation for HJC riders who want clean, fully integrated Bluetooth communication with excellent battery life. Backed by Sena's warranty.

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