Features UNIVERSAL HELMET COMPATIBILITY This Outdoor Master helmet headset is designed to be compatible with most audio-ready ski/snowboard helmets, including Giro, Smith, Burton, K2, POC, Anon, and even motorcycle helmets. RUGGED DESIGN FOR ALL CONDITIONS OM BT01 wireless headphones are made of IP45 sweat-resistance material and tested working perfectly at -20°C/-4°F. CLEAN SOUND, CLEAR HIGHS, BIG BASS OM BT01 is a wired chip equipped with optimally tuned 40mm drivers and a CSR chip for euphonious resonation with an encrypted strong and stable connection ensuring a wonderful shredding journey on the slope. LONG PLAY TIME & CONVENIENT CHARGING Up to 15 hrs playtime & 500 hrs standby time with a built-in microphone allows you to get to jamming without missing anytime from the pow to answer missed calls. The headphone can be charged directly without pulling off from the helmet. GLOVE FRIENDLY CONTROL Three glove-friendly buttons control adjust volume, change tracks, play, pause, take calls and use Siri (voice control) through the built-in microphone.