[. . . ] Comprising of an open, circum-aural headphone and a transmitter, this digital wireless headphone system delivers an uncompressed sound performance equaling those of high-end wired headphones. [. . . ] Open, circum-aural digital wireless headphone Transmitter features digital and analog inputs Power on/off, balance control and volume control integrated on headphone Ergonomic and adjustable headband for an excellent and secure fit Rechargeable integrated batteries Multi-purpose transmitter - Also functions as , easy-charge` cradle and docking station Technical Data COM 1422 EAN UPC Article no Transmitter TR 220 Power supply Power consumption in standby mode Signal-to-noise ratio Connections Number of wireless channels Frequency range Weight of transmitter Receiver HDR 220 AF frequency response Impedance Total harmonic distortion Max. rechargeable batteries) Content of delivery Packaging Packaging Type Dimension of product packaging (W x H x D) Dimension of outer master carton (W x H x D) No. 90 dB Analog: RCA; Digital coaxial: RCA; Digital optical: TORX/TOTX 3 2, 400­2, 483. 5 MHz approx. < 0. 1 % (1 kHz, 100 dB SPL) 106 dB (1 kHz, 1 Veff) 2 NiMH rechargeable batteries (BA 200, type HR03) 6­8 hours approx. [. . . ] < 0. 1 % (1 kHz, 100 dB SPL) 106 dB (1 kHz, 1 Veff) 2 NiMH rechargeable batteries (BA 200, type HR03) 6­8 hours approx. [. . . ]