Features Fits Most Helmets & Easy to Install Ultra-thin wireless helmet speakers. Lightweight, easy to install, fits most helmets. Glove-Friendly Controls Oversized buttons let you manage music, calls, Bluetooth 5.3, and a voice assistant without removing the device from your pocket. Premium Sound Experience 40mm drivers and Bluetooth 5.3 deliver stable, high-quality sound on the slopes. 30H Total Playtime Works from -20°C to 45°C with up to 30 hours total playtime and fast 2-hour charging. Built for the Slopes Durable charging box designed for reliable power and easy charging on the go. Clear Sound On Every Run Powered by intelligent audio chips, MZ04 delivers immersive, balanced sound that keeps you locked into the ride.