Sena Helmet Clamp Kit Speakers and Earbuds w Attachable Boom Mic & Wired Mic SMH-A0306. The ultimate Helmet Clamp Kit option for the SMH10. This kit will allowing fitting up to any helmet. The SMH-A0306 Helmet Clamp Kit contains ALL the options available - both the detachable boom mic or the wired mic. The option of using speakers or plug in your own earbuds using the 3.5mm Jack.