Based on SENA’s best-selling model 20S, the 20B model provides an optimal Bluetooth environment with intuitive operation and easy installation of the unit. and a Medium is 57-58cm and a Large is 59-60cm, we would generally suggest going for the smaller size as the interior will compress over time. When your lovely new helmet arrives, pop it on (after reading the advice sheet enclosed in the box) and wiggle it around to make sure the top of your head fits and is settled right in. SMART HJC Bluetooth 20B can be installed on HJC’s various models and due to compact size and aerodynamic design of the Bluetooth unit, it enhances overall look and aerodynamic design of the helmet. Based on Sena's best-selling 20S model, the 20B model provides an optimal Bluetooth environment with intuitive operation and easy installation of the device.

Smart HJC And Optimal Riding - The SMART HJC 20B provides various functions such as group intercom for optimum riding experience.The combination of this extensive specialized manufacturing experience, innovative ideas, and reasonable pricing resulted in HJC’s success in worldwide markets. To ensure that your objective and truthful report will be really beneficial to all readers, please observe the following rules.

Do the strap up and tighten it until you feel it is quite tight (but not uncomfortable - you need to breathe! With the Universal Intercom TM SMART HJC 20B can be connected to various Bluetooth communication devices.SMART HJC Bluetooth 20B can be installed on HJC's various models and due to compact size and aerodynamic design of the Bluetooth unit, it enhances overall look and aerodynamic design of the helmet. Once you have notified us that you wish to cancel, any sum debited to us will be refunded to you as soon as possible and in any event within 30 days of your cancellation. Connect easily with HJC’s innovative “Smart HJC” app for full control over the 20B’s system and functions.