http://www.audioropa.com/en/products/infrared-transmission-systems/ip112/

»IP112«: Headphones with inbuilt 2-channel IR receiver

The wireless headphone set with inbuilt 2-channel IR-receiver is suitable for the use with transmitters operating on 2.3 or 2.8 MHz. It reproduces audio signals in excellent sound quality. The easy-to-use headphones are equipped with a number of comfortable functions including the adaptation of the sound pattern to individual listening preferences. The volume can be individually adjusted on each side of the headphone.

Technical features

Receiver frequency: 2.3 MHz & 2.8 MHz (can be switched)
Modulation: FM broadband
Reception: 360°
Frequency response: 60 Hz to 12 kHz ± 3 dB
Signal-to-noise ratio: 54 dB not weighted
Power supply: 2 AAA alkaline batteries
Usage period, normal: 20 hours
Power consumption: 25 mA maximum; 20 mA typically
Maximum output: 6 mW
Receiver lens: Infrared element with ambient light filter
Operating elements: ON/OFF, volume regulation left and right, channel selector switch
Colour: black
Weight: 200 g
IP112

A-4039-0, a40390, 4039