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Designed for a variety of portable assistive listening applications, the LT-700 Portable Display RF Transmitter delivers the highest level of performance for all needs. Whether transmitting voice or music, the LT-700 offers a clear, reliable signal for use in environments without an installed assistive listening system. Wireless audio is easily and clearly picked up by any of our Listen Portable receivers, allowing you to meet your needs easily and effectively. From outdoor events to classrooms, factory tours to training spaces and more, the LT-700 is the ideal portable transmitter for nearly any setting.


One (1) LT-700 Portable Display RF Transmitter (863 MHz)
One (1) Quick Reference Card (863 MHz)
One (1) Limited Lifetime Warranty Program Card (863 MHz)
One (1) FM System Design Guide and Manual Card (863 MHz)


  • Transmits up to eight (8) channels of audio simultaneously on the 863 MHz band
  • Offers a choice between 17 different channels for flexibility and ease of setup
  • 70 dB signal-to-noise ratio provides superior audio quality
  • 100% digital signal output ensures a reliable connection to any and all receivers in use
  • Compatible with standard AA alkaline and NiMh rechargeable batteries
  • Easy-to-read Look & Listen (TM) LCD display with battery level, selected channel, and programming information
  • Built-in SmartCharge (TM) prevents batteries from overcharging
  • Mic and/or line-level inputs
  • Mute switch
  • Limited lifetime warranty with Listen Technologies’ hassle-free support
Configurations & Architectural Specs

Architectural Specs

The portable display RF Transmitter shall be capable of broadcasting on 17 channels. Channel tuning shall be capable of being locked. The transmitter shall have a SNR of 70 dB or greater. The output power shall be adjustable to quarter, half or full. The device shall have an audio frequency response of 50 Hz to 15 kHz, +/-3db. The device shall incorporate a microphone sensitivity switch. The device shall incorporate a mute switch. The unit shall operate off of 2 AA batteries. The battery door shall be capable of being mechanically locked. The device shall incorporate an LCD display that indicates battery level, channel, channel lock, low battery, battery charging, programming, and RF signal strength. The portable transmitter shall incorporate automatic battery charging circuitry for recharging of NiMH batteries. The Listen LT-700-863 is specified.
Product Specifications


Frequency Response50 Hz - 15 kHz (±3 dB)
Signal-to-Noise Ratio70 dB (A-Weighted)
Distortion< 2% total harmonic distortion (THD) at 80% deviation
Microphone InputUnbalanced, tip of 3.5mm connector, -20 dbu nominal, -30 dbu maximum, impedance 20K ohms
Microphone SensitivityThree position switch: high, middle, and low; 6db increments
Microphone Power5VDC Bias
Line InputUnbalanced, ring of 3.5mm connector, -10dbu nominal input level, -3dbu maximum, impedance 10K ohms


User ControlsPower, mute, channel UP/DOWN, Mic sensitivity, NiMH/alkaline battery, SQ enable/disable
ProgrammingChannel Lock out, Channel lock


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


Frequency Range863.050 - 864.950 MHz
Number of Channels17 wide band
Frequency Accuracy± .005% stability 32 to 122º (0 to 50ºC)
Antenna TypeUses microphone cable
Transmitter Stability50 PPM
Transmission Range0 ft. (0 m) to 250 ft. (76.2 m)
Antenna Connector3.5 mm connector
Output Power10mW maximum (adjustable)
Number of Simultaneous Transmitters8


Power SupplyI/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 Connector2.3mm 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 TypeTwo AA batteries, alkaline or NiMH
Battery Life8 hours alkaline (LA-361), 8 hours NiMH rechargeable (LA-362)
Battery Charging TimeFully automatic, 13 hours
ComplianceRoHS, WEEE, UL, PSE, CE, CUL, TUV, CB compliant


Width3.00 in. (7.6 cm)
Height5.00 in. (13.0 cm)
Depth1.00 in. (2.5 cm)
ColorDark Grey with white silk screening
Unit Weight with Batteries5.8 oz. (164 g)
Shipping Weight1.0 lb. (0.45 kg)
Weight3.9 oz. (111 g)
DoorManually Lockable. Up, down, and power buttons through door. Other controls behind door (see controls)


Temperature - Operation14 to 104º F (-10 to 40º C)
Temperature - Storage-4 to 122° F (-20 to 50° C)
Relative Humidity0 to 95% relative humidity, non-condensing


SafetyCE, ETSI, RoHS
Used With
QDoes the LT-700 provide phantom power?
AYes, 3VDC
QWill the LT-700 portable transmitter work for two-way communication?
ANo. However, Listen does recommend ListenTALK a two-way system for tour group applications where talk-back communication modes are available.
QWhat is the range of the LT-700 portable transmitter?
ALine of site up to 150 ft. (45.7 m) for 216 MHz.
QHow long do the batteries last on the portable transmitter?
AAlkaline batteries last 15 hours; NiMH rechargeable batteries last 8 hours (72 MHz & 216 MHz).
QCan I have multiple LPT-T216 transmitters operating in one facility?
AYes. 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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