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STI Rex Plus Electronic Watchdog


Order now and we'll ship same business day (if ordered before 3 pm PST).


WARNING: Cancer and Reproductive Harm –


Scare Intruders With Realistic Barking

Protect your home with a specialized motion detector designed to simultaneously alert you and deter intruders. The Rex Plus Electronic Watchdog is always on duty, guarding and protecting. Rex can sense motion through thick doors, walls or glass. When motion is detected, Rex sounds one of four selectable alerts: an angry, barking watchdog, soothing sounds to alert you of a guest's arrival, alert sounds of both an angry watchdog and a warning siren, or continual tranquil sounds of the rainforest.

  • Senses movement through walls, doors and glass
  • Barking gets more frequent as intruder gets closer
  • Plugs into any standard electrical outlet
  • Adjustable volume
  • Hear Bark Sound

The closer an intruder gets, the more frequent the barking. With an angry dog barking, intruders are encouraged to leave, and you have time to prepare if they stay.

  • Distant approach: Single or several barks
  • Medium distance: Single/multiple barks
  • Close approach: Fierce, continuous barks


  • Rex Plus Electronic Watchdog
  • AC Adapter

We Protect The Things That Protect You®

Safety Technology International (STI) is a family owned and operated business that began over 35 years ago with Jack Taylor's invention of the Stopper Pull Station Protector. STI now markets more than 1,000 products throughout the world that help prevent false fire alarms, theft, and vandalism of the devices that protect us all.


  • Manufacturer Part #: ED-50
  • Power Supply: 12 VDC, 100 mA
  • Frequency: 2.4 GHZ
  • Net Weight: 2.2 pounds, including AC adapter
  • Power Detecting: 0.22 Watts
  • Power Barking: 2.6 Watts
  • Size: 6(L) x 5-1/8(W) x 7-1/2(H) inches
  • Approvals: FCC
  • Warranty: 90 Day