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.