Designed to be used together with Speedcom's 2-person Intercom System, the SCIH Single-Ear Headset was specifically designed to be used with student helmets that are not wired for communications. The slender ear-piece and boom-mic slides between the helmet and the ear for a simple solution for in-car communications. IMSA plug is compatible with most road-race systems, making this a great alternative to a permanent radio install in a helmet. Includes one headset.