Convenient connection: Bluetooth V4.0-V5.0 version, transmission distance (wireless range) up to 10m/33ft. Pairing with mobile phones is simple and fast, suitable for smartphones iPhone, iPad, iPod, Android, tablet computers, etc. Hands-free: The wireless Bluetooth cap has a built-in microphone, stereo earphones and a microphone, listening to music, answering or hanging up the phone, hands-free, you no longer need to expose your hands to cold air to make a call. USB rechargeable and durable: built-in rechargeable lithium-ion battery, which can be easily charged via the USB charging cable (included). A full charge can use about 6 hours of talk/play time and 60 hours of standby time. Wide range of uses: warm and breathable, unisex, suitable for almost any outdoor activities and sports, including: running, hiking, camping, dog walking, skiing, mountaineering, skating, and walking. Removable and washable: After taking out the earphone from the inner bag, it can be washed with water.