August EP636 - Cordless Wireless Headphones Bluetooth Headset with Microphone,Black Bluetooth v4.0 - Quick and easy connection to any Bluetooth device Built-in Microphone - Stay connected to your mobile with hands free calling Internal Li Ion Battery - Rechargeable battery for up to 12.5 hours listening between charges Music, Volume and Call control Buttons - Answer calls and control your music Bluetooth Wireless NFC Headphones - Listen to audio from smartphones and tablets, tap to connect to NFC enabled devices