Features Premium Sound for Outdoors Experience true wireless stereo with OutdoorMaster Bluetooth headphones, featuring 40mm drivers for rich bass and clear highs, perfect for your active outdoor pursuits. Glove-Friendly Control Designed for glove use, OutdoorMaster headphones offer easy control over music and calls, compatible with smartphones, iPads, and computers, enhancing your outdoor adventures. High-Definition Audio Enjoy HDR audio technology that delivers crisp and balanced sound, with a built-in microphone for hands-free calls and voice control while skiing or hiking. Versatile Helmet Compatibility The OutdoorMaster MZ04-M Wireless headphones fit most audio-ready helmets, including popular brands, providing a lightweight and portable solution for all your outdoor activities. Durable for All Elements Built to last, the MZ04-M headphones withstand temperatures from -20°C to 45°C, offering over 10 hours of playtime and 50 hours of standby, ensuring music accompanies you through every adventure. (Note: The charging case does not come with a built-in battery and requires a power source to charge the headphones via the included cable.)