The LR-400-150 Portable Display RF Receiver is our most popular model of receiver. This receiver is excellent for assistive listening, language interpretation, tour group or personal use – anywhere transmitted audio is need to be received. The LCD display is this receivers most desired feature – it makes it easy to view the selected channel, battery life, channel lock, and RF signal strength. It can be tuned to all frequencies available in our 150 MHz products; once a frequency is selected it can be locked to prevent tampering. The LR-400-150 offers exceptional audio quality and convenient recharging options. Whether it’s voice or music, the LR-400-150 allows everyone in the audience to have a personally enhanced audio experience.

Note: for use in Australia


One (1) LR-400-150 Portable Display FM Receiver
One (1) Quick Reference Card


  • Look & Listen™ LCD shows channel, battery status, channel lock and signal strength
  • Superior audio quality – 80 dB signal-to-noise ratio (SNR), setting the industry’s sound quality standard
  • With a choice between 32 channels, Listen products are ideal for a wide range of applications
  • 100 % Digital – Listen receivers are digitally-tuned so transmission won’t drift; assurance that when a channel is selected, it stays on that channel
  • Limited Lifetime Warranty with hassle-free support
  • Look & Listen™ LCD shows channel, battery status, channel lock and signal strength
  • Uses standard alkaline or nickel-metal hydride(NiMH) batteries
  • Built in SmartCharge™ won’t allow batteries to overcharge. Charging circuitry is conveniently built into Listen’s receivers
  • Drop in charging contacts for any of Listen’s many charging cases or a charging plug on the side of the unit
  • Many accessory options make Listen products ideal for a wide range of applications
Configurations & Architectural Specs

Architectural Specs

The FM receiver shall be capable of receiving on 32 channels. The receiver shall have a SNR of 80 dB or greater. The receiver shall be capable of seeking for open channels and locked on an active channel. The device shall have a squelch. The unit shall have an audio frequency response of 50 Hz to 15 kHz (‘±3 dB). The device shall incorporate a stereo headset jack that allows the user to plug in either a mono or stereo headset and listen to audio normally. The device shall incorporate an LCD display. The receiver shall incorporate automatic battery charging circuitry. The device shall be able to use of two (2) alkaline or NiMH batteries. The Listen LR-400-150 is specified.

Product Specifications
Specification LR-400-150


Frequency Response 50 Hz - 15 kHz (±3 dB)
Signal-to-Noise Ratio SQ enabled 80 dB, SQ disabled 60 dB
Audio Output Jacks 3.5 mm (0.14 in.) connectors, unbalanced, 0 dBu nominal output level, 16 mW maximum, impedance 32 ohm
Distortion < 2% total harmonic distortion (THD) at 80% deviation


User Controls Channel up/down, SEEK, volume, Alkaline/NiMH batteries, SQ enable/disable
Programming Channel lock, squelch


LCD Channel designation, battery level, battery charging, RF signal strength and channel lock
LEDs Red, illuminated when unit is on, flashes when batteries are low or to indicate charging, flashes when locked and SEEK is pushed


Frequency Range 150.8000 MHz - 152.3500 MHz
Number of Channels 6 wide band, 27 narrow band
Sensitivity .6uV typical, 1 uV maximum for 12 dB sinad
Frequency Accuracy ± .005% stability 32 to 122 ºF (0 to 50 ºC)
Squelch Programmable in 20 steps, automatic on loss of RF signal
Antenna Type Uses earphone cable


Power Supply I/P 120 VAC; O/P 7.5 VDC 250 mA, drop in contact points for use with charging cases, power supply not included (LA-208)
Power Supply Connector 0.09 in. (2.3 mm) OD by 0.7 mm ID, barrel type connector 7.5 VDC, center positive < 250 mA, drop in contact points for use with Listen charging cases
Battery Type Two (2) AA batteries, alkaline or NiMH
Battery Life 30 hours alkaline (LA-361), 15 hours NiMH rechargeable (LA-362)
Battery Charging Time Fully automatic, 13 hours
Compliance RoHS, WEEE, UL, PSE, CE, CUL, TUV, CB


Width 2.75 in. (7.0 cm)
Height 4.25 in. (10.8 cm)
Length 1.50 in. (3.8 cm)
Color Dark Grey with white silk screening
Unit Weight with Batteries 5.8 oz (164 g)
Shipping Weight 6.1 oz (173 g)
Weight 3.9 oz (111 g)
Door Manually lockable, SEEK/channel select behind the door


Temperature - Operation 14 to 104 ºF (-10 to 40 ºC)
Temperature - Storage -4 to 122 °F (-20 to 50 °C)
Relative Humidity 0 to 95% relative humidity, non-condensing


Safety RoHS
Used With
Q What is the difference between the LR-400-150 and the LR-500-150?
A The LR-500-150 gives the user an opportunity to lockout unused channels and has the controls on the outside of the front door.
Q Can the LR-400-150 be used with multiple transmitters?
A Yes. The LR-400-150 can be used with multiple transmitters, but unlike the LR-500-150, it cannot be programmed to lock out channels.
Q How long do the batteries last on the LR-400-150 receiver?
A Alkaline batteries last 30 hours. NiMH rechargeable batteries last 15 hours.
Q What is the function of SQ?
A To reduce noise of the systems, Listen offers a noise reduction technology called ListenSQ™. Both the transmitter and receiver must have SQ on to achieve the desired results. If you are planning to use this product with older Listen systems or equipment not manufactured by Listen, you should disable SQ.
Q What is squelching?
A The purpose of squelch is to mute the audio output of your receiver when the signal from the transmitter is turned off or is too weak to be received. Without squelch you would hear radio noise in your earphone. The squelch function is preset and cannot be changed on the LR-300.
Q How many receivers can I have in a system?
A As many as you need, the number is endless.
Copyright © 1998 - 2020 Listen Technologies Corporation. All rights reserved.
Listen, ListenPoint and related marks and logos are registered trademarks of Listen Technologies Corporation. Terms of Use | Privacy Policy
Listen Technologies