LRT-4 - Viking Electronics

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Long Range 4 Channel Transmitter

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Product Details

Viking’s model LRT-4 Long Range Wireless 4 Channel Radio Transmitter can be used with Viking’s LRR-4 Long Range 4 Channel Receiver to create a high frequency, long-range (RFID) identification solution. Intended for security access control applications, the LRT-4’s wireless communication is based upon a secure, digital, anti-playback routine.

The LRT-4 Transmitter has four buttons, each corresponding to its own Wiegand output on the LRR-4 Receiver. Each Transmitter includes an integrated red LED, used to indicate both positive button press and battery strength. The LRT-4 Transmitter operates at 433 MHz allowing a transmission range of up to 400 ft (line of sight). They are also equipped standard with a 125 KHz HID* compatible potted proximity module allowing the Transmitter to also be used as a close range access credential.


Use with the following Viking models to remotely activate relays for door/gate control, etc:

  • AES-2000: Accessible Entry System with ES-3 controller (DOD 202)
  • AES-2005: Accessible Video Entry System with ES-3 controller (DOD 204)
  • C-4000: Apartment / Office Entry Controller (DOD 164)
  • ES-1: Stand Alone Keyless Entry System (DOD 193)
  • ES-3: Entry System Controller (requires power adapter) (DOD 195)
  • K-1200-IP: VoIP 12 Button Apartment Entry Phone (DOD 271)
  • K-1205-IP: VoIP Apartment Entry Phone with Camera (DOD 274)
  • K-1270-IP: VoIP Apartment Entry Phone with Card Reader (DOD 274)
  • K-1275-IP: VoIP Apartment Entry Phone with Camera/Card Reader (DOD 274)
  • K-1700-IP: VoIP Entry Phone with Keypad (DOD 253)
  • K-1705-IP: VoIP Entry Phone with Keypad/Camera (DOD 254)
  • K-1770-IP: VoIP Entry Phone with Keypad/Card Reader (DOD 257)
  • K-1775-IP: VoIP Entry Phone with Camera/Card Reader (DOD 258)
  • K-1770-3: Entry Phone with Keypad and Card Reader (DOD 275)
  • K-1775-3: Entry Phone with Camera and Card Reader (DOD 280)
  • K-1900-8-IP: VoIP Entry Phone with Handset and Keypad (DOD 361)



  • Read range of up to 400 ft (line of sight)
  • Convenient Key Fob design
  • 4 buttons to activate up to 4 different Wiegand devices
  • Secure, Rolling Code + Encryption, digital, anti-playback wireless transmission
  • Integrated 125KHz proximity module for close range access credential (can be used with Viking Proximity card readers and certain 125KHz HID* readers)
  • Replaceable CR2032 battery lasts up to 500,000 button presses
  • Robust buttons rated for up to 1 million activations
  • LED to indicate button press and battery strength
  • Internal silicone diaphram/gasket seals circuit board from moisture and debris
  • CE mark

* HID and the HID logo are registered trademarks of HID Global Corporation, an ASSA ABLOY company. All other trademarks are the property of their respective owners.


  • Output Format
    Transmitters are sequentially coded in the industry standard 26­bit Wiegand format, with exact number sequences. The Transmitter has an external number printed on the ID label found on the back of the Transmitter. Specific coding details, including internal number, facility code, and ID range can be found on the LRT-4 order form on page 4 of the Product Manual.
  • Enrollment
    Transmitter must be clicked twice within a Receiver’s read range to be learned upon initial Receiver power up. This synchronizes the transmitter and receiver rolling codes. If the transmitter is clicked more than five times outside of the Receivers read range the transmitter and receiver will be desynchronized. To re-sync, click twice again within read range.
  • Time-Out
    LRT-4 transmitters make use of a time-out feature to preserve battery life and prevent interference with other transmitters in the field. When a button is held down continuously the transmitter will transmit the code once and shutdown and will power up once the button is released.
  • Range
    Up to 400ft line of sight.
  • Battery Replacement
    Transmitters include a replaceable CR2032, 3.3V, lithium battery. The battery should be replaced when a button press does not result in a flash of the LED, reliable read range, and/or an output from the Receiver. To replace the battery, follow the directions below:

    1. Using a coin, place it in the gap (2-piece unit) near the key ring holder and twist to pop the transmitter open.
    2. Remove the old battery.
    3. Insert the new CR2032, 3.3V, lithium battery. Be sure the plus (+) side of the battery is visible when installed.
    4. Snap both pieces together.