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  • STI Rex Plus® (ED-50) — Electronic Watchdog Specifications

    September 08, 2026 2 min read

    Specification sheet for the STI Rex Plus® (Model ED-50) electronic watchdog security deterrent combining simulated dog barking with motion detection.

    Full text manual (for reference)

    Specification sheet for the STI Rex Plus® (Model ED-50) — an electronic watchdog security deterrent that combines simulated dog barking with motion detection.

    Product Overview

    In addition to the sound of a ferocious attack dog, Rex Plus offers the sounds of the rainforest. Choose the sound that suits you best: the continual sounds of the rainforest, or an annunciator mode where rainforest sounds play until an intruder is detected, then the angry barking dog (for 15-20 seconds) followed by a siren — or a mode where the barking dog gets louder and more frequent as the intruder gets closer. Rex Plus provides an excellent deterrent to burglars without the hassle of owning a real dog. With his electronic radar "eyes," Rex Plus can detect motion through thick doors, walls, and glass. Once plugged into any standard 110 VAC electrical outlet, he stays on duty around the clock.

    How It Works

    Any indoor location can be selected to detect movement, such as hidden behind the front door. Turn Rex Plus on and he begins detecting. When he detects movement (in attack dog mode), he emits the ferocious barking sounds of a large, unhappy attack dog. The closer the intruder gets, the more frequent the barking becomes; as the intruder backs off, the barking decreases in frequency and eventually stops.

    Key Features

    • Very realistic — barking gets more frequent as the intruder gets closer
    • Switches from watchdog to tranquil rainforest sounds with a simple slide switch
    • Senses movement through walls, doors, and glass
    • Variable distance sensitivity (up to 30') plus volume control
    • No installation required — plugs into a standard 110 VAC electrical outlet
    • Choice of four sound options: continuous rainforest, ferocious barking attack dog, rainforest as visitor-arrival announcer, or barking dog for 15-20 seconds then siren
    • Limited 90-day warranty

    Specifications

    Spec Value
    Model ED-50
    Power Supply 12 VDC, 100 mA
    Frequency 2.4 GHz
    Net Weight 2.2 lbs (1.0 kg)

    Rex Plus consumes minimal electricity in "detecting" mode, but uses more power when barking.

    Detection Efficiency by Material

    Material Effect on Range
    Glass Slight reduction
    Wooden Doors Slight reduction
    Plaster Walls Medium reduction
    Metal Heavy reduction
    Curtains or Drapes Slight reduction
    Fiberglass or Plastic No reduction
    Paper Cartons Slight reduction

    Warranty

    Limited 90-day warranty.

    Manufacturer: Safety Technology International (STI) · 2306 Airport Road, Waterford, MI 48327, USA · 1-800-888-4784 (4STI) · 248-673-9898 · www.sti-usa.com