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?

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! :-)

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?

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.

Is there a way to remotely "disarm" it (e.g. cell phone app)?

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.

what does the bark sound like? Can we hear a sample?

The sound is a vicious German Shepard barking...I don't have the sound for you to hear it. So sorry!

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

Product ID: 1258794

Details

Brand
STI
Color
Light Blue
Compatible Devices
Smartphone
Power Source
Corded
Product Dimensions
6.6"L x 5.5"W

⚡110V plug-in power

📡Ultrasonic motion sensor

🔊65 dB audible alert

28747 kr

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Sold byAmazon IcelandDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🐕‍🦺 Your 24/7 digital watchdog—because peace of mind never takes a break.

PLUG PLAY SECURITY - Simply plug into any standard outlet and instantly secure your space without complicated setup.
MULTI MODE ALERT SYSTEM - Choose from soothing rainforest sounds to aggressive barking and sirens for tailored security.
24 7 VIGILANT PROTECTION - Never sleeps, never rests—your round-the-clock electronic watchdog.
PENETRATES WALLS GLASS - Ultrasonic sensor detects movement through thick doors and barriers—no blind spots.
DYNAMIC INTRUDER RESPONSE - The closer the threat, the more frequent the bark—escalating alerts to keep you ahead.

The STI ED-50 Rex Plus is a compact, plug-in electronic watchdog alarm featuring a 65 dB ultrasonic motion sensor that detects movement through walls and glass. It offers four customizable sound modes—from tranquil rainforest ambiance to aggressive barking and sirens—providing continuous, reliable indoor security powered by a standard 110V outlet. Ideal for homes and businesses seeking hassle-free, around-the-clock intrusion alerts.

Specifications

ASIN	B002XITC5G
Audible Noise	65 db
Best Sellers Rank	#184,525 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #146 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 1,065 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	12.32 ounces
Manufacturer	Safety Technology Intl
Manufacturer Warranty Description	Limited 90 day warranty.
Mfr Part Number	ED-50
Model Number	ED-50
Mounting Type	Floor Mount
Number of Items	1
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	12 Ounce
Voltage	110 volts

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28747 kr

Duties & taxes included

In stock

Sold byAmazon IcelandDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Iceland.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Fatima A.

Best international shipping I've ever tried. Worth every penny!

3 days ago

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Customer service was outstanding when I had questions about the product.

2 days ago

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