QCY QY8 Bluetooth Earphones V4.1 In-ear Earbuds with Microphone for iPhone Samsung Sweatproof Sport Headphones The latest bluetooth 4.1 version,allows you to wirelessly pair with compatible devices,compaired with the old version,BT4.1 with transmission distance up to 10M,low power consumption, stable connection. Built in high performance lithium polymer battery.Offers up to 7 hours of music playback and up to 7 hours of talk time per full charge. Adopt CVC6.0 noise reduction technology , so you can enjoy high-quality stereo sound. Built-in microphone.Enables clear hands-free communication. Very lightweight.Fits comfortably around your neck. The in-ear design directs sound into your ear canal to promote immersive listening.