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Sales Data Sheet
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ED-55 Sounds
ED-55 Sounds
ED-55 Controls
ED-55 Controls

Electronic Watchdog

Helps Deter Burglars

Rex® II is versatile and provides an excellent way to deter burglars, without the annoying problems of owning a real dog. With his electronic radar eyes, Rex II can “see” through thick doors, walls and glass. When Rex II detects movement, he starts to emit the selected sound. The closer the intruder gets, the more frequent the barking sound (when selected). As the intruder backs off, the barking decreases in frequency, stopping completely when movement is out of range. He has also been known to scare a bear or two.  Rex II also offers siren or greeting alternate sounds.

For use outside of UK and Europe.


Key Features

2 Models Available



Rex Plus® Electronic Watchdog
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Rex Plus® II Electronic Watchdog
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Sales Data Sheet
Installation Sheet
FeaturesElectronic Watchdog Features
Electronic Watchdog design


  • Speaker and batteries located low in the unit for stability.
Electronic Watchdog installation


  • No installation required.
Electronic Watchdog electronics


  • Power requirements: Wall cube, 12 VDC, 0.6A output.
  • Battery operation (optional): 6 “C” alkaline (not included), 90 days typical battery life.
Electronic Watchdog options


Sound selections:

  • Dog 1, Dog 2, 2 Dogs together
  • Ding, Ding Dong, Chirp
  • Siren 1, Siren 2, Voice messages or prompts:
  • “Warming up” when power is applied
  • “Armed” after warm up cycle is complete
  • “Growl sound” when unit is muted
  • “Armed” when coming out of mute
  • “Please replace batteries” at power up or after mute button is pressed
  • “Dogs,” “Greetings” or “Sirens” as the sound selection switch is moved
Electronic Watchdog other features

Other Features

  • Controls at the top for easy access.
  • Water resistant flip top provides convenient access to the controls.
  • Ideal for cabins, garages, boat houses, homes, etc.
  • Detection range: adjustable up to 26 feet (range reduced through obstructions).
  • Detection angle: 150 degrees.
  • Limited 90 day warranty.