The HD1 In Ear Wireless is a Bluetooth earphone with integrated three button remote and high quality microphone incorporated into the neckband. Bluetooth 4.1 wireless supports convenient multi connection with up to 2 devices at once, with 3 way calling capability. It incorporates NFC one touch Bluetooth pairing with smart devices and has up to 10 hour battery life. An intuitive voice prompt system notifies of pairing status and battery life status. There is a vibration alert for incoming calls and supports USB audio with USB charging.