--- product_id: 63724484 title: "Safety Technology International ED-50 Rex Plus Electronic Watchdog, Barking Dog Alarm by Safety Technology Intl" brand: "sti" price: "$8.34" currency: USD in_stock: true reviews_count: 6 url: https://www.desertcart.us/products/63724484-safety-technology-international-ed-50-rex-plus-electronic-watchdog-barking store_origin: US region: United States of America --- # 30 ft ultrasonic sensor range 65 dB alert volume Plug & play 110V power Safety Technology International ED-50 Rex Plus Electronic Watchdog, Barking Dog Alarm by Safety Technology Intl **Brand:** sti **Price:** $8.34 **Availability:** ✅ In Stock ## Summary > 🐕‍🦺 Your silent, tireless watchdog—because peace of mind never sleeps. ## Quick Answers - **What is this?** Safety Technology International ED-50 Rex Plus Electronic Watchdog, Barking Dog Alarm by Safety Technology Intl by sti - **How much does it cost?** $8.34 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.us](https://www.desertcart.us/products/63724484-safety-technology-international-ed-50-rex-plus-electronic-watchdog-barking) ## Best For - sti enthusiasts ## Why This Product - Trusted sti brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Effortless Setup:** Simply plug into any standard outlet—no batteries needed. - • **Wide Indoor Coverage:** Ultrasonic sensor detects movement through walls and glass up to 30 feet. - • **Versatile Sound Modes:** Choose from watchdog barks, sirens, or calming rainforest sounds. - • **Dynamic Intruder Alerts:** Barking frequency increases as threats get closer. - • **24/7 Vigilant Protection:** Always on duty—no breaks, no downtime. ## Overview The Safety Technology International ED-50 Rex Plus is a plug-in electronic barking dog alarm featuring a 30-foot ultrasonic sensor that detects movement through walls and glass. It offers four sound modes including protective barks and sirens, delivering 65 dB alerts that increase in frequency as intruders approach. Designed for continuous 24/7 indoor security without batteries, it’s ideal for homes and businesses seeking reliable, hassle-free protection. ## Description Product Description Safety Technology International, Inc. - STI ED-50 Rex Plus Electronic Watchdog Barking Dog Alarm. This electronic watchdog alarm never needs sleep, a walk, food or water; yet is always on duty guarding and protecting. Choose from four settings: continual tranquil sounds of the rainforest, alert sound of an angry and protective watchdog, soothing sounds to alert you of a guest's arrival, and alert sounds of both the angry watchdog and a warning siren. Rex Plus can see through thick doors, walls and glass. Once you plug his cord into any standard 110-VAC electrical outlet, he'll stay on duty around the clock. Place Rex Plus in any location indoors where you would like him to detect and watch him go. When there is any movement detected, Rex Plus will alert you with the sounds you have chosen. The closer the intruder, the more frequent the sounds. Ideal for homes, apartments, mobile homes, RVs, jewelry stores, hotels, public and private buildings of virtually every kind. Limited 90 day warranty. Safety Technology International, Inc. "We protect the things that protect you" Legal Disclaimer No paperwork ## Features - Barking dog alarm - Place in any location indoors where you want to detect movement - Plugs into any standard electrical outlet - Reliable 24 hour protection - The closer an intruder gets the more frequent the barking ## Technical Specifications | Specification | Value | |---------------|-------| | Battery description | Alkaline | | Voltage | 12 Volts | | Control method | Touch | | Noise level | 65 Decibels | | Mounting type | Floor Mount | | Maximum range | 30 Feet | | Sensor technology | Ultrasonic Sensor | | UPC | 783961712341 750215330019 | | Global Trade Identification Number | 00750215330019 | | Manufacturer | Safety Technology Intl | | Part Number | ED-50 | | Product Dimensions | 16.76 x 13.97 x 26.92 cm; 349.27 g | | Item model number | ED-50 | | Size | 1 | | Material | HAWA | | Thickness | 11 Inches | | Item Package Quantity | 1 | | Certification | certified frustration-free | | Included Components | Barking Dog Alarm,Audible/Annunciation | | Batteries included? | No | | Batteries Required? | No | | Item Weight | 349 g | ## Product Details - **Colour:** Blue - **Brand:** STI - **Power source:** Corded Electric - **Compatible devices:** Smartphone - **Product dimensions:** 16.8L x 14W x 26.9H centimetres ## Images ![Safety Technology International ED-50 Rex Plus Electronic Watchdog, Barking Dog Alarm by Safety Technology Intl - Image 1](https://m.media-amazon.com/images/I/714OBVZU9cL.jpg) ## Questions & Answers **Q: Stupid question: if I set it by the front door and then walk out the front door to leave, won't I set it off?** A: Yes. But it will stop when you are out of range. We just say as loud as we can, KILLER SHUT UP WELL BE BACK SOON! :-) **Q: My front door which I want to guard is made of steel/aluminum. Would it work sensing anyone that approaches my door from the outside?** A: Mine does not work through my metal door, but it also has to go through the storm door also. It does work through walls and ceilings. **Q: Is there a way to remotely "disarm" it (e.g. cell phone app)?** A: Devices like Wemo are now widely available, fairly cheap, connect to the internet through one's home router & can so be controlled by Amazon Electra or a cell phone app. It should now be quite easy to interface one with a device like Rex Plus Barking Dog Alarm, to turn the speaker of f& on remotely. **Q: what does the bark sound like? Can we hear a sample?** A: The sound is a vicious German Shepard barking...I don't have the sound for you to hear it. So sorry! ## Customer Reviews ### ⭐⭐⭐⭐⭐ 5.0 out of 5 stars U Get What U Pay For *by H***N on Reviewed in the United Kingdom on 10 November 2024* This was a replacement for my previous identical one which finally died after 20 years faithful, faultless service. That is a very impressive working life span and puts the price nicely into context. ### ⭐⭐⭐⭐⭐ The benefits of a dog without the Poop *by D***S on Reviewed in the United States on 20 September 2024* Saved our house from being broken into. We live in a very nice area of Vegas, but people's homes are constantly broken into. Both of our neighbor's homes were broken into, but ours is left alone. We travel for work and were worried about leaving the house unattended, but this pup does a fantastic job. Sounds like a real, BIG German Shepherd type dog, not a repetitive fake one. You can adjust the sensitivity, it's not that complicated to use or set up. ### ⭐⭐ Sensibilidade *by C***. on Reviewed in Mexico on 6 December 2019* La sensibilidad al movimiento no es lo ideal ## Frequently Bought Together - Safety Technology International, Inc. ED-50 Rex Plus Electronic Watchdog, Barking Dog Alarm - FakeTV - FTV-11 - Advanced Burglar Deterrent Device – Widescreen Realistic Television Simulator with Reflective Lens - Dummy Home Security Device with Lights – Protect Your House & Valuables - FakeTV - FTV-10 Charcoal Design Burglar Deterrent – Simulated TV Light with Frosted Lens – Energy-Efficient LED Dummy Home Security Technology – Prime Quality House & Valuables Protection Equipment --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.us/products/63724484-safety-technology-international-ed-50-rex-plus-electronic-watchdog-barking](https://www.desertcart.us/products/63724484-safety-technology-international-ed-50-rex-plus-electronic-watchdog-barking) --- *Product available on Desertcart United States of America* *Store origin: US* *Last updated: 2026-05-20*