The Sena Technologies Universal Clamp Kit allows you to easily transfer your 20s, 20s Evo and 30k bluetooth headsets from one helmet to another (including half helmets). This kit includes everything you need with 3 different microphones, 2 mounting methods and a variety of microphone covers.; ; Universal helmet clamp Allen wrench Boom microphone holder Foam speaker covers Surface mounting plate Hook and loop adhesives USB Power & Data cable 2.5mm to 3.5mm Audio cable 12v Cigarette charger Wired boom microphone Wired microphone