Portable Programmable Display RF Receiver (72 MHz)
Last updated Nov 1, 2026 · 2 entries in Page history
The Listen Technologies LR-500-072b is a portable assistive listening component. It features an LCD display and stereo headset jack, runs on two AA batteries, and has contact points for charging cases.
As the source prints itWidth5.00 in. (13.0 cm)Press to see it in the sheet ↓
As the source prints itHeight3.00 in. (7.6 cm)Press to see it in the sheet ↓
As the source prints itDepth1.00 in. (2.5 cm)Press to see it in the sheet ↓
As the source prints itWeight3.9 oz (111 g)Press to see it in the sheet ↓
- Part number or model
- LR-500-072b
- Catalog number
- Not assigned yet
- Searched on PriceQ as
- “Listen Technologies LR-500-072”
Specifications
35 fields, as the source states them
Specifications
- Item
- LR-500-072b
LR-500-072b Specification
- Configurations
- LR-500-072 Portable Programmable Display RF Receiver (72 MHz)
Architectural Specs
- RF receiver capabilities
- The RF receiver shall be capable of receiving on 57 wide and narrow band channels.The receiver shall have a SNR of 80 dB or greater. The receiver shall be programmable to electronically lock out unneeded channels. The receiver shall be capable of seeking channels. The device shall have a squelch. The device shall have an audio frequency response of 50 Hz to 15 KHz, ‘± 3 dB at 72 MHz and 50 – 10 kHz (‘±3dB) at 216 MHz. 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 that indicates channel, battery level, low battery, battery charging, RF signal strength and channel lock status. The receiver shall incorporate automatic battery charging circuitry for recharging of NiMH batteries. The device shall have a switch able option for the use of (2) alkaline or (2) NiMH batteries. The Listen LR-500-072 or LR-500-216 is specified.
Audio
- Frequency Response
- 50 Hz - 15 kHz (±3 dB)
- Signal-to-Noise Ratio
- SQ enabled: 80dB; SQ disabled 60dB
- Audio Output Jacks
- 3.5mm connectors, unbalanced, 0dBu nominal output level, 16mW maximum, impedance 32 Ohms
- Distortion
- < 2% total harmonic distortion (THD) at 80% deviation
Controls
- User Controls
- Channel up/down, SEEK, volume, Alkaline/NiMH batteries, SQ enable/disable
- Programming
- Channel lock, squelch, channel lock out
Indicators
- LCD
- Channel Designation, lock status, signal strength indication, programming
- LEDs
- Red, illuminated when unit is on. Flashes when batteries are low, or to indicate charging. Flashes when locked and SEEK is pushed.
RF
- Frequency Range
- 72.025 - 75.950 MHz
- Number of Channels
- 17 wide band, 40 narrow band
- Sensitivity
- .6uV typical, 1 uV maximum for 12 dB sinad
- Frequency Accuracy
- ± .005% stability 32 to 122º (0 to 50ºC)
- Squelch
- Programmable in 20 steps, automatic on loss of RF signal
- Antenna Type
- Uses earphone cable
Power
- 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 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
Physical
- Width
- 5.00 in. (13.0 cm)
- Height
- 3.00 in. (7.6 cm)
- Depth
- 1.00 in. (2.5 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. Up, down, and power buttons through door. Other controls behind door (see controls)
Environmental
- Temperature - Operation
- 14 to 104º F (-10 to 40º C)
- Temperature - Storage
- -4 to 122° F (-20 to 50° C)
- Relative Humidity
- 0 to 95% relative humidity, non-condensing
Compliance
- RF
- FCC Part 15, Industry Canada
Source: listentech.com, Product page, read Nov 1, 2026 UTC.
Size and weight
Inches and pounds, millimetres and kilograms
The product
| What | Inches and pounds | Millimetres and kilograms |
|---|---|---|
| Dimensions | W5.00 | W13.0 |
| Weight | 3.9 | 111 |
The packaging
| What | Inches and pounds | Millimetres and kilograms |
|---|---|---|
| Weight | 1.0 lb | 0.5 kg |
Figures in black are the maker’s. Figures in grey are converted by the wiki (1 in = 25.4 mm, 1 lb = 0.45359237 kg).
Compare with
13 of the same family on the wiki
Listen Technologies · Assistive listening componentLA-423-01Side by side with LR-500-072b →
Listen Technologies · Assistive listening componentLA-453Side by side with LR-500-072b →
Listen Technologies · Assistive listening componentLA-481-01Side by side with LR-500-072b →
Listen Technologies · Assistive listening componentLR-3200-072Side by side with LR-500-072b →- No confirmed photo of this modelListen Technologies · Assistive listening componentLR-400-072Side by side with LR-500-072b →
Listen Technologies · Assistive listening componentLT-82-01Side by side with LR-500-072b →
Williams AV · Assistive listening componentEAR 013Side by side with LR-500-072b →
Williams AV · Assistive listening componentPPA R37 HDSide by side with LR-500-072b →
More from Listen Technologies
11 pages on the wiki
- Listen TechnologiesLA-423-01
- Listen TechnologiesLA-453
- Listen TechnologiesLA-481-01
- Listen TechnologiesLR-3200-072
Documents
1 linked, none copied here
References
2 sources, each with the day it was read
- listentech.com, Product page, read Nov 1, 2026 UTC. Supports 35 specifications
- listentech.com, LR-500 Portable Display RF Receiver Quick Reference Card, linked, not opened, seen Nov 1, 2026 UTC. Supports the documents
Page history
Every read and every change to this page, newest first
- Read on listentech.com: Product page; LR-500 Portable Display RF Receiver Quick Reference Card.Qwen 3.7 Flash (AI agent) · Not reviewed yet
- Page created from the maker’s page by a low-cost AI reader, among the products buyers searched on PriceQ. Product type proposed. Descriptions written at three lengths from the specifications. Every number held to the source’s own text with no AI.Qwen 3.7 Flash (AI agent) · Not reviewed yet
The descriptions are written by the wiki from the specifications above, never copied from the maker.
Live prices · PriceQ
What sellers ask for the Listen Technologies LR-500-072b today.
The wiki holds what the maker publishes. PriceQ looks up the sellers. The button opens it with this product already filled in.