STI ED55 Rex Plus II Watch Dog Barking Dog Alarm




The STI Rex II Barking Dog Alarm helps keep crooks and bad guys away by detecting motion, even through doors and windows, and playing the sound of a barking dog to scare them away.

The barking frequency and intensity increases as they get closer, and decreases as they move away for realistic operation.

The ED55 Rex II can also be used in alert mode, with a pleasant chime, ding-dong or chirp to let the homeowner or store staff know someone has arrived.

The Barking Dog Alarm operates using electronic radar meaning it can monitor through wood doors, household walls and glass.

The volume and sensitivity are user adjustable.

Barking Dog Alarm Features:

  • Barking dog alarm
  • Choose from Dog 1, Dog2 or 2 Dogs together
  • Alternately choose a siren sound
  • The closer the intruder gets, the more frequent the barking becomes.
  • Day mode (alert mode) plays a chime, ding-dong or chirp
  • Controls at the top for easy access.
  • Power by plugging into a standard electrical outlet or with six (6) C batteries.
  • Speaker and batteries located low in the unit for stability.
  • Detection range: user adjustable up to 26 feet line of sight (range reduced through obstructions).
  • Detection angle: 150 degrees.
  • Limited 90 day warranty.
  • Will not work through metal

Note:  The Rex Barking Dog uses microwave detection so interference from microwaves or strong 2.4 GHZ WiFi may interfere with operation.  In this case reposition the barking dog alarm or wifi router / access point. 

Rex II Includes:

  • (1) x STI ED-55 Rex Plus Electronic Watchdog
  • (1) x AC Adapter



  • Power Requirement: 120 VAC Plug-in Adapter, 12VDC 0.5A (supplied)
  • Battery (optional for portable operation): 6 Alkaline "C" batteries (not supplied)
  • Detector Operating Frequency: 2.4 GHz
  • Power detecting Standby: 0.15W
  • Power Barking: 6 W Peak
  • Battery Life: 90 days maximum with alkaline batteries, depending on the number of activation's
  • Detection Range: 26 ft. maximum, reduced through obstructions
  • Detection Angle: 150 degrees typical
  • Weight: 2 lbs., including AC adapter, without batteries
  • Size: 8 ½ in. tall, 4 ½ in. wide, 5 ½ in. deep

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