---
product_id: 495236423
title: "Hendun Upgraded Power Failure Alarm, GFCI Circuit Failed Dector Alerter, Smart Power Outage Reminder for Freezer in Garage, Monitor Power Cut of CPAP, Breaker and GFI/GFCI Trip Alarm"
brand: "hendun"
price: "€ 34.36"
currency: EUR
in_stock: true
reviews_count: 13
category: "Hendun"
url: https://www.desertcart.pt/products/495236423-hendun-upgraded-power-failure-alarm-gfci-circuit-failed-dector-alerter
store_origin: PT
region: Portugal
---

# Voltage abnormality LED indicator 108 dB loud alarm 2 years standby on 3 AAA batteries Hendun Upgraded Power Failure Alarm, GFCI Circuit Failed Dector Alerter, Smart Power Outage Reminder for Freezer in Garage, Monitor Power Cut of CPAP, Breaker and GFI/GFCI Trip Alarm

**Brand:** hendun
**Price:** € 34.36
**Availability:** ✅ In Stock

## Summary

> ⚡ Never miss a beat—power protection that’s loud, smart, and always on point!

## Quick Answers

- **What is this?** Hendun Upgraded Power Failure Alarm, GFCI Circuit Failed Dector Alerter, Smart Power Outage Reminder for Freezer in Garage, Monitor Power Cut of CPAP, Breaker and GFI/GFCI Trip Alarm by hendun
- **How much does it cost?** € 34.36 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.pt](https://www.desertcart.pt/products/495236423-hendun-upgraded-power-failure-alarm-gfci-circuit-failed-dector-alerter)

## Best For

- hendun enthusiasts

## Why This Product

- Trusted hendun brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Plug & Play Simplicity:** Just plug into any 100-240V socket—no complicated setup, perfect for monitoring freezers, CPAP machines, aquariums, and more.
- • **Ultra-Long Battery Life:** Powered by 3 AAA batteries (not included) offering up to 2 years standby and 72 hours continuous alarm—no frequent recharging hassles.
- • **Smart Voltage Monitoring:** LED strip instantly signals voltage status—green for normal, red for high, and blue for low—keeping your devices safe from surges.
- • **Eco-Friendly & Economical:** Avoid costly food spoilage and equipment damage with a reliable, energy-efficient circuit failure detector trusted by thousands.
- • **Instant Power Outage Alert:** Stay ahead of spoilage with a piercing 108 dB alarm and tri-color flashing light that wakes you up even during deep sleep.

## Overview

The Hendun Upgraded Power Failure Alarm is a compact, easy-to-use device that plugs into any standard outlet to monitor power supply interruptions. Featuring a loud 108 dB alarm and tri-color LED voltage indicators, it alerts users instantly to power outages or voltage abnormalities. Powered by 3 AAA batteries, it offers up to 2 years of standby time and 72 hours of continuous alarm, making it ideal for safeguarding freezers, CPAP machines, and other critical appliances. Its simple plug-and-play design and adjustable alert tones ensure reliable, eco-friendly protection against costly power failures.

## Description

Hendun Upgraded Power Failure Alarm, GFCI Circuit Failed Dector Alerter, Smart Power Outage Reminder for Freezer in Garage, Monitor Power Cut of CPAP, Breaker and GFI/GFCI Trip Alarm - desertcart.com

Review: Nice & Loud - definitely would wake me up if power goes down! - I find AC power is going down more often than it used to, partly because it is California and they have some protection built in such that if a power line gets hit by a branch or even animal it could cause it to shut down power to prevent triggering a wildfire. It usually stays down for at least 2 + hour, sometimes more. Several times I've been on the very of having a whole refrigerator and freezer's worth of food spoiling so I ended up getting a 2 Kwh power station solely for my frig/freezer. Already had to use it twice in the last few months. During the day it is easy to know obviously when power goes down and I just go down and plug my frig into the power station. This little gem provides the protection if power ever goes down in the middle of the night while I am sleeping. It is nice & loud and would easily wake me up from even the deepest slumber. Well worth the investment and I highly recommend it. Only one con I would note. I'm not sure this would be loud enough if for example you are monitoring an outlet or device on the other side of the house or something. For me I just plug it into an outlet right in my bedroom because when I have a power issue the entire home is always affected. Suggest an enhancement where the main device can communicate with a wireless receiver and sound the alarm in the bedroom even if the monitoring device itself is on the other side of the house. Nevertheless this product is easily worth 5 stars. Update: on 6/8 AC power went down about 10:30pm when I was sleeping. This product indeed did its job well and woke me up from a deep sleep. Power was down until almost 4:30am and then was barely up for like an hour and went down again for another hour and a half. There is 100% chance my entire freezer and frig would have been full of spoiled food had it not been for this great product. Wish I could give this 10 stars!!
Review: Review of the power outage alarm. - These little power outage gadgets are awesome! They're the only model I could find that allows you to use regular AAA batteries. All the other brands/models use rechargeable batteries which go dead in a few years, and then you have another item that needs to be recycled. They are loud, work reliably and have the buttons on the front to easily silence them in an outage. I purchased a huge bag of 14 of these units and every last one worked flawlessly. I'm using the Energizer AAA lithium batteries in these which have up to a 20-year shelf life. Since the power only goes out once or twice a year for only a few hours they should last a while. Also, they have a choice of alert tones to choose from that DO NOT sound like a smoke detector. You could get your home broken into by the fire dept if your neighbor calls them saying your smoke detector is going off. Not a problem with this alarm as the alert tones sound different and are intermittent.

## Features

- ✅ SIMPLY AND EASILY - Just plug the powerout alarm into any 100-240V socket or power cable and easily monitor the power supply to your basement freezer / fridge, pump, oxygenerator,CPAP, aquarium
- ✅ VARIOUS ALARM METHODS - Accompanied by a 108 dB noise alert and a bright tri-colour flashing light with various adjustable tones and volumes
- ✅ VOLTAGE ABNORMALITY MONITORING- There is an LED strip to indicate the voltage status. Green indicates normal, red indicates high voltage and blue indicates low voltage
- ✅ USE 3 AAA BATTERIES (not included), 2 years standby and 72 hours continuous alarm.Items with built-in rechargeable batteries B0BFNSHH65
- ✅ ECONOMICAL INVESTMENT- the 110v or 220v circuit testers reduces losses when you experience power outages / surge or accidents.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B0BFPJKZXG |
| Batteries Included? | No |
| Batteries Required? | No |
| Battery Description | Alkaline |
| Best Sellers Rank | #43,632 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #84 in Circuit Testers |
| Control Method | Touch |
| Customer Reviews | 4.6 4.6 out of 5 stars (296) |
| Date First Available | September 18, 2022 |
| Description Pile | Alkaline |
| Included Components | Detector |
| Installation Method | Dashboard Mount |
| Item Package Quantity | 1 |
| Item Weight | 3.2 ounces |
| Item model number | hnfpa |
| Manufacturer | Changzhou Hengdun Electronic Technology Co Ltd |
| Mounting Type | Tabletop Mount |
| Noise Level | 108 Decibels |
| Product Dimensions | 2.3 x 2.3 x 2.8 inches |
| Sensor Technology | Voltage Sensor |
| Voltage | 240 Volts |

## Product Details

- **Brand:** HENDUN
- **Color:** white
- **Compatible Devices:** [Inferred] Devices mentioned in product description
- **Power Source:** Battery Powered
- **Product Dimensions:** 2.3"L x 2.3"W x 2.8"H

## Images

![Hendun Upgraded Power Failure Alarm, GFCI Circuit Failed Dector Alerter, Smart Power Outage Reminder for Freezer in Garage, Monitor Power Cut of CPAP, Breaker and GFI/GFCI Trip Alarm - Image 1](https://m.media-amazon.com/images/I/51DhlCQPtUL.jpg)

## Available Options

This product comes in different **Model** options.

## Questions & Answers

**Q: Does this device have an alert when the batteries need to be replaced?**
A: Thank you very much for your interest in our HENDUN power failure alarms.
It has a low voltage alert function.
Beeps “Du-Du” sound every 30 minutes when battery-voltage is lower than 3.6V.  Please change the batteries in time or use rechargeable batteries.

**Q: How does this plug into "any 240v outlet" when 240v has a different prong configuration.  Is an adapter included?**
A: Thank you very much for your interest in HENDUN power failure alarm.
The plug of the alarm is shown in the video. If it can't plug into 240V outlet directly, please use it after plugging in the converter on 240V outlet first.
The adapter is not included.
Thanks again.

**Q: Will this alert your phone, if outlet trips?**
A: Thank you very much for your interest in HENDUN power failure alarm.

When the outlet trips, only the local alert will be sent, and the mobile phone cannot receive the alert.

**Q: It states the working temperature is from -23f - about 15f.  texas garages can be over 100f in the summer time. what is the real working temperature?**
A: Thank you very much for your interest in our blackout alarms.
Because of our mistake, the working temperature was described wrongly, it should be: 14 ~ 140℉

## Customer Reviews

### ⭐⭐⭐⭐⭐ Nice & Loud - definitely would wake me up if power goes down!
*by A***W on September 23, 2023*

I find AC power is going down more often than it used to, partly because it is California and they have some protection built in such that if a power line gets hit by a branch or even animal it could cause it to shut down power to prevent triggering a wildfire. It usually stays down for at least 2 + hour, sometimes more. Several times I've been on the very of having a whole refrigerator and freezer's worth of food spoiling so I ended up getting a 2 Kwh power station solely for my frig/freezer. Already had to use it twice in the last few months. During the day it is easy to know obviously when power goes down and I just go down and plug my frig into the power station. This little gem provides the protection if power ever goes down in the middle of the night while I am sleeping. It is nice & loud and would easily wake me up from even the deepest slumber. Well worth the investment and I highly recommend it. Only one con I would note. I'm not sure this would be loud enough if for example you are monitoring an outlet or device on the other side of the house or something. For me I just plug it into an outlet right in my bedroom because when I have a power issue the entire home is always affected. Suggest an enhancement where the main device can communicate with a wireless receiver and sound the alarm in the bedroom even if the monitoring device itself is on the other side of the house. Nevertheless this product is easily worth 5 stars. Update: on 6/8 AC power went down about 10:30pm when I was sleeping. This product indeed did its job well and woke me up from a deep sleep. Power was down until almost 4:30am and then was barely up for like an hour and went down again for another hour and a half. There is 100% chance my entire freezer and frig would have been full of spoiled food had it not been for this great product. Wish I could give this 10 stars!!

### ⭐⭐⭐⭐⭐ Review of the power outage alarm.
*by L***E on August 24, 2025*

These little power outage gadgets are awesome! They're the only model I could find that allows you to use regular AAA batteries. All the other brands/models use rechargeable batteries which go dead in a few years, and then you have another item that needs to be recycled. They are loud, work reliably and have the buttons on the front to easily silence them in an outage. I purchased a huge bag of 14 of these units and every last one worked flawlessly. I'm using the Energizer AAA lithium batteries in these which have up to a 20-year shelf life. Since the power only goes out once or twice a year for only a few hours they should last a while. Also, they have a choice of alert tones to choose from that DO NOT sound like a smoke detector. You could get your home broken into by the fire dept if your neighbor calls them saying your smoke detector is going off. Not a problem with this alarm as the alert tones sound different and are intermittent.

### ⭐⭐⭐⭐⭐ Loud and effective.
*by J***. on September 23, 2025*

We are renting a home built in the 1970s. The standard for ground fault circuits in this area at that time was to have a single GF circuit in the garage that handled all the outlets that were near water sources: kitchen, bathrooms, etc. I recently purchased a chest freezer and put it in the garage. If the circuit gets tripped in the kitchen or bath (e.g., toaster, oven, hair dryer) there was no way for us to know that the freezer was without power. The alarm is very loud and there is no way anyone would be able to sleep through it; never mind miss it if awake in a 2,500 square-foot ranch house. 😃 Would recommend.

## Frequently Bought Together

- Hendun Upgraded Power Failure Alarm, GFCI Circuit Failed Dector Alerter, Smart Power Outage Reminder for Freezer in Garage, Monitor Power Cut of CPAP, Breaker and GFI/GFCI Trip Alarm
- Power Failure Alarm for Freezer, Briidea Power Outage Alarm with LED Indicator Lights and 80-120dB Adjustable Alarm, Perfect for Monitoring Refrigerators, Freezers, and Sewage, MK-077
- Briidea Power Failure Alarm with LED Indicator & 80dB Siren, Powered by Rechargeable Battery (included), Perfect for Monitoring Refrigerators, Freezers, Sump Pumps, Aquariums

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*Product available on Desertcart Portugal*
*Store origin: PT*
*Last updated: 2026-02-10*