Part number: 505565 Closed back, circumaural headphone system with excellent digital wireless audio transmission delivering range up to 328ft/100m (line of sight).Connectivity Technology: WirelessSelectable hearing boost presets with an additional noise suppression mode for clearer dialogues and superior speech intelligibility. Music listening mode for increased dynamic range.Multi-purpose transmitter supports both Digital and Analog Inputs in addition Automatic and Manual Level Control - also functions as easy-charge cradle and docking stati