Power Acoustik WLHP100 PA INFARED WIRELESS HEADPHONES Single-channel UHF IR TX Wave headphone receiver.Connectivity Technology: Wireless Receives broadcasts up to 180' from the transmitter Adjustable straps and vinyl-padded ear cushions provide a comfortable fit Controls include volume, auto level and auto mute; auto off function helps conserve battery power Frequency response: 30Hz - 20kHz Adjustable Headphone Straps Single -Channel Uhf Ir Tx Wave Headphone Receiver Receives Broadcasts Up To 10 Ft From Transmitter On/Off Switch Saves Battery Life Variable Volume Control