Bern Unlimited Men's HH Outdoor Tech Wireless Audio Upgrade Kit for Snow Helmet Fits the following BERN Hard Hats: Baker, Watts, Macon, Muse, Lenox & Brighton Outdoor Tech is all Bluetooth/wireless, high fidelity 14 Hour Play time, IPX 4 Sweat and Moisture Resistant Patented 2-button control system allows you to adjust volume, change tracks, play/pause Built in Microphone, USB rechargeable lithium-ion battery