Costech Qy7 V4.0 Bluetooth Mini Lightweight Wireless Stereo Sports/Running and Gym/Exercise Bluetooth Earbuds Headphones Headsets with Microphone Bluetooth V4.0 portable lightweight and sweat proof design built-in microphone built-in rechargeable li-ion battery multipoint pairing (up to 2 phones) Eliminates the white noise and delivers a clean audio experience offering hours of pure enjoyment Voice command for picking up/rejecting calls built-in 14.2mm neodymium driver clear bass resonance, CVC wind noise reduction, superior sound isolation Sweat-proof, durable design, onscreen battery meter, up to 6 hours of talk/playing time and 150 hours standby time CSR Bluetooth V4.1 breakthrough exclusive technology doubles QCY/QY7 playtime to solid 8 hours offering a full week of workouts/full day of listening