The earbuds featured with built-in 43mAh battery and 500mAh large capacity battery box which makes sure 23hours battery life, 5 hours for music listening and 4 hours for calling.With the ergonomic and oblique in ear design ,ZTE Buds is more suitable for the ear canal, and is lightweight with 3.4g ,you can enjoy more comfortable .Bluetooth headphone features with a waterproof nano-coating inside .A high pressure seal design with two stage integrated body provides IPX4 water resistant rating to effectively prevent rain and sweat damage and enjoy high quality music anywhere. Block out all the background noise, thanks the two high definition microphones in each bud that uses ENC environmental noise reduction with the inclusion of an intelligent noise. Wear it while cycling, running, hiking and your chats or music will go smoothly. Target ambient noises indoors, outdoors, and while traveling on the train, subway, or bus for a distraction-free listening experience.