http://www.humantechnik.com/en/products/tvaudio-listening-systems/introson-ir/
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»introsonIR« – a low-price TV listening system with infrared transmission

The wireless infrared TV audio system »introson-IR« offers excellent value for money and features a featherweight underchin receiver. The user adjusts the volume, the sound as well as the right/left balance using the relevant controller on the receiver. As with all infrared transmission systems, there must be a given line of sight between the transmitter and receiver.

The transmitter is directly connected to the audio signal source (e.g. a TV-set) via cable and serves as charging station for the receiver.

Specifications

###Receiver  
Operating time per recharge: approx. 12-13 hours
Recharge time: approx. 8 hours
Battery type: NiMH 750 mAh, rechargeable
Audio frequency range: 15-20000 Hz
Signal-to-noise ratio: typically 60 dB
Maximum volume: approx. 120 dB(A)
Weight: approx. 56 g (including batteries)
###Transmitter  
Signal range: up to 12 metres
Powers supply: 100 - 230V AC to 12V DC power supply unit
introson IR Set mit Sender & Empfänger
Accessories
Rechargeable battery for IntrosonIR, 1.2 V, 750 mAh
Connection lead set for Introson IR / 2.4
5-bay-charger for IntrosonIR
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Perforated ear-pieces, 2 pairs
Perforated ear-pieces, 24 pairs
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