AT&T PBH20-BLK Over-Ear Bluetooth 3.0 Stereo Headphones with 4 Hours of Continuous Playback and Built in Mic, Black Bluetooth 3.0 with up to 4 hours of continuous playback, wirelessly streams audio from any Bluetooth device. Connectivity Technology: Wired/Wireless Metal alloy housing with 40 mm neodymium drivers to deliver an unbelievable rich bass and tune Built-in mic for hands-free speakerphone Lightweight design and super soft ear pads allow you to wear them comfortably for extended period Wired or wireless compatibility with easy pairing and easy access controls