Bolayu Stereo Wireless Bluetooth 4.1 Earphone Handfree Headphone For iPhone 6/6S Gold The use of distance: 10m. Bluetooth v4.1+ EDR. Overcharge/overdischarge protected. Compatible with any BT version. Applications: Supports any, IPAD tablet, desktop computer with a Bluetooth device class phones. Music playing: 3.5 Hours. Talk time: About 4 hours. Charge hours: About 1.5 hours. Standby time: About 110 hours. Function: call dialing, remote answer / end / reject / switch, telephone redial, mute, volume control, English switch, smart one for two, music pause / play, up and down the song.