The Oppo Bluetooth Headphones with Microphone feature extra soft ear cups for all day comfort. With built in music controls and a microphone you can answer/reject calls control the volume and music with a push of a button. The built in microphone also make the Oppo Bluetooth Headphones a great option for any webinar or virtual meeting. The Oppo can be played at max volume for over 4 hours. The headphones can be charged in under 3 hours with the provided Micro USB Charging Cable. The headphones will automatically shut off if not connected within 3 minutes. Bluetooth working range is 10 meters (33 feet). A 39" 3.5mm Aux Cable is included.