Please note – for the HDR 120 to function it must be used in conjunction with the RS 110, RS 120 or RS 135 Wireless headphone system. Frequency response 22 – 19500 hertz. Power supply- 2 AAA batteries .
Sennheiser HDR 120 Headphones, Extra Wireless Headphones for RS110 and 120 Systems (charger not included)
Open, stereo, supra-aural, wireless RF headphone
Detailed, analytical sound reproduction with strong bass response; Suitable for all types of modern music and TV application
Wireless freedom with reception through walls and ceilings
Very lightweight headphones, extremely comfortable to wear.SPL for peak deviation: 106 dB
Impedance – 24 Ohms