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Listen Technologies LR42


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Product Overview

The LR-42 stethoscope receiver is a very easy to use, comfortable and user friendly. This all-in-one receiver can receive up to four (4) channels in mono or stereo. It uses standard AAA alkaline batteries for more than 30 hours of use, or a NiMH rechargeable battery pack that delivers 15 hours of use per charge. The unit features auto shut-off after 30 minutes of no audio carrier, further extending battery life. The LR-42 boasts high performance audio specs in a small package and is compatible with other manufacturers’ products. The LR-42 is used for government compliance (such as ADA), assistive listening, language interpretation, live theatre, houses of worship, courtrooms, secure rooms and auditory description.


  • LR-42 IR Stethoscope 4-Channel Receiver
  • LA-152 IR Receiver Battery Compartment (Non-Charging)
  • Quick Reference Card



  • Secure wireless communication – ideal for applications
    where isolation of the signal is important or where security
    is a concern
  • Stylish, all-in-one unit stetho design – no wires to tangle for easy distribution
  • Receives up to four (4) channels mono or stereo – provides outstanding performance with crystal clear sound
  • Uses standard AAA batteries (available anywhere) or rechargeable Listen NiMH battery pack – gives you ultimate flexibility in managing battery life
  • Auto shut-off feature (after 30 minutes of no carrier) -
    saves battery life
  • Ear tips can be easily cleaned or replaced


Full specifications are available under the Downloads tab above

  • Carrier Frequencies: 2.3 MHz, 2.8 MHz, 3.3 MHz, 3.8 MHz
  • Number of Channels: 4 selectable channels
  • IR Detectors: 2 detectors under front IR lens
  • Sensitivity: 1 nW/cm2 at 40 db SNR
  • Frequency Accuracy: +/- .005% stability 0 to 50C
  • Squelch: Automatic on loss of RF signal (40 db SNR)
  • Compliance: FCC Part 15, Industry Canada, CE, RoHS

Product Downloads

  • LR42 Data Sheet PDF 0.2 MB
  • LR42 Manual PDF 4.9 MB


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*Prices are in AUD, include GST and are subject to change. Please call National Audio for pricing and availability on the LR42.