Built-in Battery: With high performance rechargeable polymer battery, this headphon e provides 8-10 hours of music time, less than 3 hours of charging time. FUNCTIONAL! Durable Earphone With mic Tangle Free cables and Call Receive / Cut and Play / Pause Button (Change Track on Double and Triple Click) makes it easier to have long lasting, tangle and frustration free music and call experience. These sweat resistant earphones are great for running and gym workouts.. Universally Compatibility: Suitable for most Bluetooth-enabled devices, such as for iPhone6s plus 5S 5 4S and Android smartphones Samsung Galaxy phones and so on. Multi functional Design: Support wireless connection via Bluetooth, & wired connection with phones/computer; Support TF card playback, insert the TF card into the headphone to play music when there is no phone; High Fidelity & Clear Bass Effect: This headphone supports various sound effects adjustment, easily realise the sound quality you prefer. Control Type: Voice Control.