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Listen Technologies LR-400 receiver technical specificationsLR-400LR-400

  • The FM receiver shall be capable of receiving on 57 wide and narrow band channels with a SNR of 80dB or greater.
  • The receiver shall be capable of seeking channels.
  • The device shall have an adjustable squelch.
  • The device shall have an audio frequency response of 50Hz to 15KHz, +/- 3dB at 72MHz, or of 50Hz to 10kHz, +/- 3dB at 216MHz.
  • The device will incorporate a stereo headset jack that allows the user to plug in either a mono or stereo headset and listen to the audio normally.
  • The device shall incorporate an LCD display that indicates channel, battery level, low battery, battery charging, RF signal strength.
  • The receiver shall incorporate automatic battery charging circuitry for recharging of NiMH batteries.

The Listen LR-400 is specified. The LR-400 carries a 90-Day Performance Guarantee and the Listen Limited Lifetime Warranty.


RF RF Frequency Range
72.025 - 75.950 MHz
216.025 - 216.975 MHz
Number of Channels
57 (17 wide, 40 narrow)
57 (19 wide, 38 narrow)
.6uV typical, 1 uV maximum for 12dB SINAD
Frequency Accuracy
± .005% stability 0° to 50°C (32° to 122° F)
Uses earphone cable
Antenna Connector
3.5mm connector
Programmable in 20 steps
FCC Part 15, Industry Canada
** All system specifications are wireless end-to-end
System Frequency Response
63Hz - 15kHz (±3dB)
63Hz - 10kHz (±3dB)
System Signal to Noise Ratio
SQ enabled: 80dB; SQ disabled 60dB
SQ enabled: 80dB; SQ disabled 50dB
System Distortion
<2% total harmonic distortion (THD) at 80% deviation
3.5mm connectors, unbalanced, 0dBu nominal output level,
16mW maximum, impedance 32 Ohms
Controls Set Up Controls
Alkaline/NiMH batteries, SQ enable/disable and programmable squelch setting
User Controls
Volume, channel UP/DOWN, SEEK.
(All controls except volume are electronically lockable, and are behind the door).
Squelch can be adjusted for sensitivity and signal capture control. Channel selection can be locked by holding the SEEK button for 5 seconds. Unit cannot be programmed to seek only used channels, however, it is capable of entering squelch mode.
Indicators LCD Display
Indicates channel, RF signal strength, lock status, squelch, battery power level and channel programming.
Red, illuminates when unit is on. Flashes when batteries are low. Flashes when charging. Flashes when locked and user attempts to seek to another channel.
Power Battery Type
Two AA batteries, alkaline or NiMH
Battery Life (Listen batteries)
30 hours alkaline (LA-361), 15 hours NiMH rechargeable (LA-362)
Battery Charging (NiMH only)
Fully automatic, 14 hours
Power Supply Connector
2.3mm OD by 0.7mm ID, barrel type connector. 7.5VDC, center positive <250mA. Drop in contact points for use with Listen charging cases.
UL Listed
Physical Dimensions
3.0 in x 1.0 in x 5 in WxDxH (7.6cm x 2.5cm x
Unit Weight
3.9oz (111g)
Unit Weight with batteries
5.8 oz (164.4g)
Shipping Weight
1.0 lbs (453.6kg)
Manually lockable. UP, DOWN and SEEK through door, other
controls behind door (see Controls above).
Environmental Temperature - Operation
-10° to 40°C (14° to 104° F)
Temperature - Storage
-20° to 50°C (-4° to 122° F)
0 to 95% relative humidity, non-condensing

Prices, specifications and availability subject to change without notice.



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