Ausdom Bluetooth4.0 Headphone, Black/Red (M04s) NFC function allows to connect your NFC-compatible devices in a fast and convenient way Giving Long-time Comfort -- Artificial protein leather of earmuffs simulated to human skin texture Built-in microphone for headset functionality with controls for media and phone calls, compatible with all the Bluetooth-enabled device Durable Strong Power -- Build-in 400mA rechargeable battery, provide about 20hours music playing time and more than 250 hours standby time DWS Technology -- an exclusive detailed-wireless-sound system combines the latest Bluetooth technology, perfect tuning technology and the ear engineering technology