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The Listen LT-700 Portable Transmitter is used to wirelessly broadcast audio for a variety of portable applications. Whether its voice or music, you can broadcast your audio to everyone in the audience without having to carry a microphone or be plugged into a wall. The LT-700 is excellent for factory tours, outdoor events, wireless microphone applications, classrooms, training, or personal use – anywhere you need to amplify sound, but don’t have (or want) an installed system. With the many features of the LT-700, portable transmission has never been easier for users!


One (1) LT-700 Portable Display RF Receiver
One (1) Owner’s manual (72 MHz & 216 MHz)


  • Superior Audio Quality – 80 dB signal-to-noise ratio, setting the industry’s sound quality standard
  • A choice between 57 channels, complete antenna and accessory options make Listen products ideal for a wide range of applications
  • Look & Listen™ LCD shows channel, battery status, and programming information
  • 100 % Digital – Listen receivers are digitally-tuned so transmission won’t drift; assurance that when you select a channel, it stays on the channel
  • Transmit up to three (3) channels simultaneously.
  • Uses standard alkaline or NiMH batteries
  • Transformer charging plug or drop in charging contacts
  • Built in SmartCharge™ won’t allow batteries to overcharge. Charging circuitry is conveniently built into Listen’s LT-700 Transmitter; never worry about unplugging a transformer at a certain time
  • Mute switch
  • Mic and/or line level inputs
Configurations & Architectural Specs


LT-700-072 Portable Display RF Transmitter (72 MHz)
LT-700-216 Portable Display RF Transmitter (216 MHz)
LT-700-863 Portable Display RF Transmitter (863 MHz)

Architectural Specs

The portable RF display transmitter shall be capable of broadcasting on 57 channels. The unit shall incorporate a microphone sensitivity switch. The device shall broadcast on both wide and narrow band channels with a SNR of 80 dB or greater. The device shall have an audio frequency response of 50 Hz to 15 KHz, ‘±3 dB at 72 MHz, or of 50 Hz to 10 kHz, ‘±3 dB at 216 MHz. The device will incorporate a mute switch. The battery door shall be capable of being mechanically locked. The device shall incorporate an LCD display that indicates channel, battery level, low battery, battery charging, and RF signal strength. The portable transmitter shall incorporate automatic battery charging circuitry for recharging of NiMH batteries, with the ability to charge via a wall transformer or drop in charging case. The Listen LT-700-072 or LT-700-216 is specified.

Product Specifications
Specification LT-700-216


Frequency Response 50 - 10 kHz (±3 dB)
Signal-to-Noise Ratio SQ enabled: 80 dB; SQ disabled 60 dB
Distortion < 2% total harmonic distortion (THD) at 80% deviation
Microphone Input Unbalanced, tip of 3.5 mm connector, -45 dBu nominal input level, -30 dBu maximum, impedance 20k Ohms
Microphone Sensitivity Three position switch: high, middle, and low; 6db increments
Microphone Power 5VDC Bias
Line Input Unbalanced, ring of 3.5mm connector, -10dbu nominal input level, -3dbu maximum, impedance 10K ohms


User Controls Power, mute, channel UP/DOWN, Mic sensitivity, NiMH/alkaline battery, SQ enable/disable
Programming Channel Lock out,Channel lock


LCD Channel Designation, lock status, signal strength indication, battery life, RF Power
LEDs Red, illuminated when unit is on. Flashes when batteries are low, or to indicate charging. Flashes when muted


Frequency Range 216.0125 - 216.9875 MHz
Number of Channels 19 wide band, 38 narrow band
Frequency Accuracy ± .005% stability 32 to 122º (0 to 50ºC)
Antenna Type Microphone cable
Transmitter Stability 50 PPM
Transmission Range From 0 to 150 ft. (45.7 m)
Antenna Connector 3.5 mm connector
Output Power Less than 100mW
Number of Simultaneous Transmitters 3


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 15 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 3.00 in. (7.6 cm)
Height 5.00 in. (13.0 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, controls accessible through doors


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


Safety RoHS
RF FCC Part 15, Industry Canada
Used With
Q Does the LT-700 provide phantom power?
A Yes, 3VDC
Q Will the LT-700 portable transmitter work for two-way communication?
A No. However, Listen does recommend ListenTALK a two-way system for tour group applications where talk-back communication modes are available.
Q What is the range of the LT-700 portable transmitter?
A Line of site up to 150 ft. (45.7 m) for 216 MHz.
Q Can I use a line source with the portable transmitter?
A Yes. Listen offers the LA-263, a mic/line input cable for this use.
Q How long do the batteries last on the portable transmitter?
A Alkaline batteries last 15 hours; NiMH rechargeable batteries last 8 hours (72 MHz & 216 MHz).
Q Can I have multiple LPT-T216 transmitters operating in one facility?
A Yes. Multiple Channels and power settings enable multiple LPT-T216 transmitters to operate within the same facility even in adjacent rooms. However, when multiple transmitters are being used, they will need to transmit on different channels or have adequate distance between the transmitters so they do not interfere with each other. For further information, please refer to the quick setup guide.
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