---
product_id: 1258794
title: "Safety Technology International, Inc. ED-50 Rex Plus Electronic Watchdog, Barking Dog Alarm"
brand: "sti"
price: "AR$355272"
currency: ARS
in_stock: true
reviews_count: 13
category: "Sti"
url: https://www.desertcart.com.ar/products/1258794-safety-technology-international-inc-ed-50-rex-plus-electronic-watchdog
store_origin: AR
region: Argentina
---

# 24/7 plug-in power 30 ft ultrasonic sensor range 65 dB realistic bark volume Safety Technology International, Inc. ED-50 Rex Plus Electronic Watchdog, Barking Dog Alarm

**Brand:** sti
**Price:** AR$355272
**Availability:** ✅ In Stock

## Summary

> 🐕‍🦺 Your tireless electronic watchdog—always on, always alert.

## Quick Answers

- **What is this?** Safety Technology International, Inc. ED-50 Rex Plus Electronic Watchdog, Barking Dog Alarm by sti
- **How much does it cost?** AR$355272 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.com.ar](https://www.desertcart.com.ar/products/1258794-safety-technology-international-inc-ed-50-rex-plus-electronic-watchdog)

## 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

- • **Compact & Certified:** Sleek floor-mount design with frustration-free certification for easy setup and peace of mind.
- • **Plug & Protect 24/7:** No batteries, no downtime—just continuous, reliable protection from a standard outlet.
- • **Dynamic Bark Frequency:** Barking intensifies as intruders get closer—instant alert escalation.
- • **Four Customizable Sound Modes:** Choose from soothing rainforest sounds to aggressive watchdog alerts tailored to your vibe.
- • **Ultrasonic Intruder Detection:** Sees through walls and glass up to 30 feet for unmatched indoor security.

## Overview

The Safety Technology International ED-50 Rex Plus is a compact, plug-in electronic watchdog alarm featuring a 30-foot ultrasonic sensor that detects movement through walls and glass. It offers four sound modes including realistic barking and soothing alerts, with volume up to 65 decibels. Designed for continuous 24/7 indoor protection without batteries, it’s ideal for homes and businesses seeking a hassle-free, customizable security solution.

## 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" From the Manufacturer Rex Plus is the electronic watchdog that never sleeps and the soothing sounds of the rainforest! 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 feets arrival, and alert sounds of both the angry watchdog and a warning siren. Rex Plus can inchessee inches through thick doors, walls and glass. Once you plug his cord into any standard 110-VAC electrical outlet, he feetll stay on duty around the clock. Ideal for homes, apartments, mobile homes, RVs, jewelry stores, hotels, public and private buildings of virtually every kind.

Review: i love rex!!! - due to the divided reviews, i was hesitant in purchasing rex. now i am so relieved i did. it is easy to set up & it does what it advertises to do. we have lots of dogs in the neighborhood & our rex sounds every bit as authentic. the set-up of authentic dog barking pattern is very real....then the feature where you can set dog barking AND after several barks, a piercing alarm sounds is a wonderful addition to our security system. i would highly recommend this product & would buy again if i had to. an update: i have to add that our rex sits out in the back outdoor laundry room which is near a vulnerable area of our fenced yard (i live in panama). i have rex sitting on top of the clothes dryer with an empty laundry basket over it & all of this covered with a sheet....you cannot see rex. the entrance is behind rex & yes, he will bark when we are behind him....however, i unplug when i am going to use the laundry area. this has worked perfectly for us. because it is an open-air laundry room....covered with rod iron bars (typical in panama) the birds would fly in & set rex off with one or two barks. that didn't bother me....what did was the birds pooping all over the laundry area. we bought some very popular shade producing material popular here & covered the entire area with this. now rex is not set off by the birds because they cannot get in. however, we have tested rex by standing in the area which is vulnerable, approx 12' away, across a 4' high cement wall around the launry room....rex does a good job detecting motion there & would scare off anyone trying to enter. we have rex set to dog barking with a piercing alarm after several barks. the machine will reset itself after a couple minutes....so if you are away & the intruders have been scared away, you don't have to worry about the machine continuously making noise. we have neighbors who know we have rex & they check our house if we are away....great neighborhood watch system helps also. we had a professional security company come out & do an assessment of our security measures, including rex, & they believe we have done a great job & rex is definitely what homeowners need who do not own nor want to own a real dog. we are proud of our rex & always reward him with a snack for ourselves....win-win :) remember....if you are not happy with it....you can always return it. i live in panama & i had so much faith in this purchase, knew it would cost me too much to return to the states & was willing to bite the bullet on purchasing it. i have no regrets & still highly recommend rex. added security is always a good idea.
Review: Best Alarm Dog! - I've now purchased three "Rex" alarm dogs (to place in front of multiple doors)! The first two purchases were directly through the manufacturer (I think), and now I recently purchased this one through desertcart, which is less expensive. There are two versions of "Rex," but I can't remember which is the original version. Regardless, I prefer this version, as "Rex" sounds like an actual German Shepherd (the other version sounds muffled)! "Rex" sounds so real, my alarm once went off in the middle of the night, triggering the police. They actually thought I had a good "guard dog" until I showed them who or better what was barking at them! Neither of them had ever seen an electronic guard dog before so they were amazed! So if you want the effects of a "guard dog" but you don't want to deal with shedding or spend money on food, grooming, vet bills, etc., this is the one for you! "Rex" notifies you of a threat in REAL time, unlike the Ring Camera which has a delay! The range is also amazing. "Rex" detects motion up to 26 feet and it is also very sensitive, which you can adjust. But this goes both ways, as "Rex" will bark at you too! So I have my "sensitivity" level kind of on the low side because when I first installed it, "Rex" was barking at us on the second level! You can play around with the range! The other "Rex" I have in front of my slider door was barking at the coyotes in the outfield, so I, too, had to turn that sensitivity range down so it only detects motion in my backyard. Though I've recently purchased a real guard dog (who destroyed one of "Rex's" cords), I will continue to utilize "Rex," as I have it in front of multiple doors, making my dog's job easier. I recommend purchasing this especially if you are a single parent or you live alone. Rex gives you enough time to prepare for an intruder, however that looks on your end!

## 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 |
|---------------|-------|
| ASIN | B002XITC5G |
| Audible Noise | 65 Decibels |
| Best Sellers Rank | #199,980 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #160 in Smoke Detectors & Fire Alarms |
| Brand | STI |
| Built-In Media | Barking Dog Alarm,Audible/Annunciation |
| Color | Light Blue |
| Compatible Devices | Smartphone |
| Control Method | Touch |
| Customer Reviews | 3.9 out of 5 stars 1,067 Reviews |
| Global Trade Identification Number | 00750215330019 |
| Item Dimensions L x W x H | 6.6"L x 5.5"W x 10.6"H |
| Item Weight | 0.77 Pounds |
| Manufacturer | Safety Technology Intl |
| Manufacturer Warranty Description | Limited 90 day warranty. |
| Mfr Part Number | ED-50 |
| Model Number | ED-50 |
| Mounting Type | Floor Mount |
| Power Source | Corded Electric |
| Product Dimensions | 6.6"L x 5.5"W x 10.6"H |
| Sensor Technology | Ultrasonic Sensor |
| Size | 1 |
| UPC | 783961712341 750215330019 |
| Unit Count | 1.0 Count |
| Voltage | 110 Volts |

## Product Details

- **Color:** Light Blue
- **Brand:** STI
- **Power Source:** Corded Electric
- **Compatible Devices:** Smartphone
- **Product Dimensions:** 6"L x 5.5"W x 7.5"H

## Images

![Safety Technology International, Inc. ED-50 Rex Plus Electronic Watchdog, Barking Dog Alarm - 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

### ⭐⭐⭐⭐⭐ i love rex!!!
*by S***K on July 3, 2013*

due to the divided reviews, i was hesitant in purchasing rex. now i am so relieved i did. it is easy to set up & it does what it advertises to do. we have lots of dogs in the neighborhood & our rex sounds every bit as authentic. the set-up of authentic dog barking pattern is very real....then the feature where you can set dog barking AND after several barks, a piercing alarm sounds is a wonderful addition to our security system. i would highly recommend this product & would buy again if i had to. an update: i have to add that our rex sits out in the back outdoor laundry room which is near a vulnerable area of our fenced yard (i live in panama). i have rex sitting on top of the clothes dryer with an empty laundry basket over it & all of this covered with a sheet....you cannot see rex. the entrance is behind rex & yes, he will bark when we are behind him....however, i unplug when i am going to use the laundry area. this has worked perfectly for us. because it is an open-air laundry room....covered with rod iron bars (typical in panama) the birds would fly in & set rex off with one or two barks. that didn't bother me....what did was the birds pooping all over the laundry area. we bought some very popular shade producing material popular here & covered the entire area with this. now rex is not set off by the birds because they cannot get in. however, we have tested rex by standing in the area which is vulnerable, approx 12' away, across a 4' high cement wall around the launry room....rex does a good job detecting motion there & would scare off anyone trying to enter. we have rex set to dog barking with a piercing alarm after several barks. the machine will reset itself after a couple minutes....so if you are away & the intruders have been scared away, you don't have to worry about the machine continuously making noise. we have neighbors who know we have rex & they check our house if we are away....great neighborhood watch system helps also. we had a professional security company come out & do an assessment of our security measures, including rex, & they believe we have done a great job & rex is definitely what homeowners need who do not own nor want to own a real dog. we are proud of our rex & always reward him with a snack for ourselves....win-win :) remember....if you are not happy with it....you can always return it. i live in panama & i had so much faith in this purchase, knew it would cost me too much to return to the states & was willing to bite the bullet on purchasing it. i have no regrets & still highly recommend rex. added security is always a good idea.

### ⭐⭐⭐⭐⭐ Best Alarm Dog!
*by E***A on January 13, 2024*

I've now purchased three "Rex" alarm dogs (to place in front of multiple doors)! The first two purchases were directly through the manufacturer (I think), and now I recently purchased this one through Amazon, which is less expensive. There are two versions of "Rex," but I can't remember which is the original version. Regardless, I prefer this version, as "Rex" sounds like an actual German Shepherd (the other version sounds muffled)! "Rex" sounds so real, my alarm once went off in the middle of the night, triggering the police. They actually thought I had a good "guard dog" until I showed them who or better what was barking at them! Neither of them had ever seen an electronic guard dog before so they were amazed! So if you want the effects of a "guard dog" but you don't want to deal with shedding or spend money on food, grooming, vet bills, etc., this is the one for you! "Rex" notifies you of a threat in REAL time, unlike the Ring Camera which has a delay! The range is also amazing. "Rex" detects motion up to 26 feet and it is also very sensitive, which you can adjust. But this goes both ways, as "Rex" will bark at you too! So I have my "sensitivity" level kind of on the low side because when I first installed it, "Rex" was barking at us on the second level! You can play around with the range! The other "Rex" I have in front of my slider door was barking at the coyotes in the outfield, so I, too, had to turn that sensitivity range down so it only detects motion in my backyard. Though I've recently purchased a real guard dog (who destroyed one of "Rex's" cords), I will continue to utilize "Rex," as I have it in front of multiple doors, making my dog's job easier. I recommend purchasing this especially if you are a single parent or you live alone. Rex gives you enough time to prepare for an intruder, however that looks on your end!

### ⭐ BUYER BEWARE!!!
*by L***E on November 3, 2025*

BUYER BEWARE!!! I expected to put this product on a window sill looking outside to where I thought an intruder would enter my property. While it might detect intruders outside, the barking started as soon as I turned the unit on and moved inside the room of my house. I tried what other people suggested: wrapped the backside of the unit in three layers of tin foil along with placing the unit in a metal box and also moving it to a room where there was no 2.4 GH of wifi interference. This morning I called the if-you-need-help phone number inside the Rex Plus box, and had the unpleasant experience of talking to an agent who had a giant attitude and almost confrontive approach to "helping?????" me. After explaining the issue, she told me that this product was a 360 degree motion detector--which I found hard to believe. If 180 degrees is the half of the circle's detention range pointed outside and the other 180 degrees/half of the circle is pointed back into the room, how am I supposed to use this product if every time I walk in the room where the detector is located, it starts barking like a vicious dog?????? Assessment: This product as designed is USELESS!!! It also uses a 2.4 GH frequency (like mine and other's wifi units also use) and the barking never stops, and the barking is the same intensity and sound over and over as it is just a continuous loop. We just got ripped off for the $96.54 price tag; don't do the same. The idea for this product is great; this company's execution of it is 1000% off the mark for a useful, functional product.

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*Product available on Desertcart Argentina*
*Store origin: AR*
*Last updated: 2026-05-19*