Connector Type:Audio line-in ( mini-phone stereo 3.5 mm ), Sound Output Mode:Stereo, Diaphragm:40 mm, Headphones Technology:Dynamic, Connectivity Technology:Wireless - radio, Frequency Response:18 - 22000 Hz, Headphones Form Factor:Full size, Included Accessories:2 rechargeable batteries, Run Time (Up To):20 hour(s), Battery:2 x headphone battery - rechargeable - Nickel Metal Hydride, Power Device:Power adapter + charging stand - external, Included Qty:2, Transmission Range:100 m, Radio Frequency Range:863 - 865MHz