Extended Playtime: 7 hours of music playing or 200 hours of standby time on a single 2.5-hour fully charge with a 5V external charger. Super quick charge time with full charge light indication. Advanced Technology: With latest Bluetooth 4.1 technology , it can get easier and faster pairing with smartphones, tablets, and other Bluetooth enabled music devices. With IPX4 sweat resistant design, this wireless earphones prevent against sweat and moisture damage. CD-Quality Wireless Sound: It provides a CD-like high quality wireless sound audio over Bluetooth 4.1 for compatible devices. Get wonderful sound in clear high & low volume. Built-in mic with voice notification of incoming calls sound. Noise cancellation: Built-in Microphone with CVC noise cancellation ensures a clearer recording quality. Allows for high quality and clear voice, even in noisy environments, like inside a gym or running/cycling on the road. Best Workout Sweatproof Bluetooth Earphone in Daily Life: Stable stay in ear tech with comfortable ear hooks for a customized, firm fit with excellent noise isolation. Great for Running, Jogging, Hiking, Biking, Gym etc. Neckband design, no wires tangling, and it\'s easy to storage to your sports armband or arm package bag.