Sennheiser RS 160 RF Wireless Headphones Connectivity Technology: Wireless Closed circumaural digital wireless headphones Dynamic headphones with bass driven audio Ergonomic adustable headband for excellent fit Compact portable transmitter with multi-receiver capability Digital volume control with mute function Not compatible with Bluetooth technology Compact portable transmitter with multi-receiver capability Digital volume control with mute function Closed circumaural digital wireless headphones with adjustable headband Not compatible with Bluetooth technology Compact portable transmitter with multi-receiver capability Digital volume control with mute function Closed circumaural digital wireless headphones with adjustable headband Not compatible with USB port, requires DC power and an audio jack