UClear SPKAP100 HBC100 Accessory Pack An additional pair of speakers allows installation in a second helmet. Boomless microphones produce crisp, accurate sound in extreme wind and noise environments. Compatible with UCLEAR HBC100 Moto and HBC120 SNOW controller units. Easily move UCLEAR control unit from helmet to helmet Speakers easily fit inside ear section of most motorcycle, snowmobile, snowboard, and ski helmets