The LR-300-072 Portable Digital RF Receiver provides the same unbeatable audio performance as our full-featured receiver line in a simple, affordable package. Capable of receiving the 17 most common wide-band channels, the LR-300-072 features convenient recharging options, strong signal reception and audio clarity, and a multi-function LED in place of the LCD screen available on our other digital receivers.

Note: The LR-300 is available only for use on the 72 MHz frequency, and is approved for assistive listening use in the U.S. by the FCC. Check with your local government for specific regulations regarding broadcast frequencies in your country.


One (1) LR-300 Portable Digital RF Receiver
One (1) Quick Reference Card


  • Superior audio quality from the 80 dB signal-to-noise ratio (SNR)
  • Compatible with 17 common wide-band frequencies
  • 100% digital for improved signal strength and clarity
  • Works with alkaline and NiMH rechargeable batteries
  • Built-in Smart Charge (TM) technology prevents battery overcharging and extends battery life
  • Drop-in charging contacts for use with Listen Technologies charging cases
Configurations & Architectural Specs

Architectural Specs

The RF receiver shall be capable of receiving on 17 wide and narrow band channels.The receiver shall have a SNR of 80 dB or greater. The device shall be able to be locked on a single channel. The unit shall incorporate a multi-functional LED that indicates power, channel lock, low battery, and battery charging. The receiver shall be capable of seeking channels. The device shall have an audio frequency response of 50 Hz – 15 kHz (‘±3 dB) at 72 MHz. The device shall incorporate a stereo earphone jack that allows the user to plug in either a mono or stereo earphone(s). The device shall be able to enable companding with the SQ function. The unit shall operate off of two (2) AA batteries; alkaline or NiMH. The receiver shall incorporate automatic battery charging circuitry for recharging of NiMH batteries. The device shall have a switchable option for the use of alkaline or NiMH batteries. The Listen LR-300-072 is specified.

Product Specifications
Specification LR-300-072


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 ohms
Distortion < 2% total harmonic distortion (THD) at 80% deviation


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


LCD None
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 72.025 - 75.975 MHz
Number of Channels 17 wide band
Sensitivity .6uV typical, 1 uV maximum for 12 dB sinad
Frequency Accuracy ± .005% stability 32 to 122 ºF (0 to 50 ºC)
Squelch Yes, non-adjustable
Antenna Type Uses earphone cable


Power Supply I/P 120VAC; O/P 7.5VDC 250 mA, drop in contact points for use with charging cases, power supply not included (LA-208)
Power Supply Connector 2.3mm OD by 0.7mm ID, barrel type connector 7.5 VDC, center positive < 250mA, 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 compliant


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 1.0 lbs (0.5 kg)
Weight 3.9 oz (111 g)
Door Manually lockable, SEEK behind door


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


Safety RoHS
RF FCC Part 15, Industry Canada
Used With
Q What is the difference between the LR-300 and the LR-400?
A The LR-400 is more "user friendly" because it has the LCD Display, which will show the channel selection, battery life and signal strength. The LR-400 also has an adjustable squelch setting.
Q Can I use the LR-300 with the LT-700?
A We DO NOT recommend using the LR-300 with the LT-700 Portable RF Display Transmitter. The LR-300 was designed to be used with the LT-800 Stationary RF Transmitter only.
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 Does this receiver sound as good as your other receivers, which are more expensive?
A Yes, all Listen receivers have the same superior audio quality (20 dB less hiss than any other competitor).
Q How do I SEEK for a new channel?
A If you hold down SEEK momentarily, the receiver will search for the nearest channel in use.
Q How do I lock the SEEK function?
A Holding SEEK for longer than 4 seconds will lock the receiver on the current channel. When SEEK has been locked, the SEEK function is no longer useable until the same process is achieved to unlock the unit. The LED on the top of the device will blink if the unit is locked and requested to SEEK another channel.
Q How many receivers can I have in a system?
A As many as you need, the number is endless.
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