Audio-Technica ATH-WS99BT Solid Bass Bluetooth Wireless Over-Ear Headphones with Built-In Mic & Control Bluetooth wireless technology with mic and music and volume controls built into the ear cup for answering/ending calls, controlling music & video playback and controlling volume on Bluetooth wireless devices. Connectivity Technology: Wireless Pairs with up to eight Bluetooth wireless devices Double Air Chamber System naturally expands bass output for powerful bass without sacrificing audio clarity Large 53 mm drivers for outstanding sound quality Built-in, high-quality headphone amplifier ensures clear and accurate sound reproduction from the wireless signal