POPFIRST L8D Wi-Fi Power Failure Alarm

The POPFIRST L8D is a plug-in Wi-Fi power failure alarm for appliances such as freezers, refrigerators, aquariums, and sump pumps. It is designed to sound locally and send app notifications when it detects an outage, with a backup alarm duration claimed to reach up to 12 hours.

At a glance

Sends app push notifications over 2.4 GHz Wi-Fi through Smart Life or Tuya, according to the listing.
A red flashing LED and audible alarm indicate an outage locally.
The buzzer is listed as adjustable across three volume levels, with a maximum of 110 dB.
A built-in backup battery is claimed to keep the alert active for up to 12 hours after an outage.
An extended outlet on the device is claimed to leave a socket available for another household appliance.

Price

$23.99Save 20%

Reference price: ~~$29.99~~

Price checked: Nov 14, 2026

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Often bought together

GoveeLife WiFi Refrigerator Thermometer Sensor with Alarm, 1-Pack & Gateway | Monitor fridge/freezer temp remotely with app alerts & buzzer 230ft range. For kitchen/hot tub, only support 2.4G Wi-Fi

$25.48

Pros and cons

Pros

Combines an audible alert, flashing LED, and app notification for outage awareness.
Designed for several outage-sensitive uses, including freezers, aquariums, and sump pumps.
The listing describes automatic alarm release when power returns, as well as a cancel button.

Cons

Remote notifications depend on a 2.4 GHz Wi-Fi connection and app setup.
SMS and email alerts require a subscription according to the listing. The included app notifications are described as free.

Technical specifications

8 specifications

Identity
Brand	POPFIRST
Model	L8D

Connectivity and controls
Control methods listed	App, Push Button

Dimensions and installation
Dimensions listed	2"L x 2"W x 3"H
Weight listed	0.12 kg

Alarm and power
Maximum audible alert listed	110 db
Battery type	Alkaline
Battery quantity and requirement	1 9V batteries required. (included)

What to know before buying

Listing details to confirm

The listing says the backup alert lasts up to 12 hours and also says to charge the device in an outlet for two hours before use. Treat the duration as a listing claim, not a verified runtime. The title calls this a freezer alarm, but its described function detects power failure rather than freezer temperature. Confirm the selected listing's app, outlet arrangement, and included battery details before purchase.

Who is it for?

A good fit for

Freezer or refrigerator owners seeking notice of a power interruption through an audible alarm and phone push notification.
Aquarium or sump-pump owners who want an outage alert, provided their Wi-Fi and app setup are suitable.

Less suited to

Buyers who need temperature monitoring or a freezer-door-open alert. The described device detects loss of power, not those conditions.
Buyers who require SMS or email alerts without a paid app subscription.
Locations without compatible 2.4 GHz Wi-Fi if remote app notifications are needed.

POPFIRST L8D Wi-Fi Power Failure Alarm · photo 2 — Additional product photo 2

Customer reviews on Amazon

4.3 / 5 · 73 ratings

5 stars73%73%
4 stars11%11%
3 stars4%4%
2 stars3%3%
1 star9%9%

Customer feedback is positive about connectivity and functionality, including reports of phone notifications when connected to Wi-Fi. That is relevant to the L8D's stated 2.4 GHz app-alert design, but feedback does not establish performance in every network or setup. Aggregate ratings lean favorable overall while still including a notable lower-rating share, so they do not remove the need to account for app and Wi-Fi dependence.

Positive themes

Customer feedback describes connectivity and functionality positively.

Frequently asked questions

Does the POPFIRST L8D monitor freezer temperature?

No temperature-monitoring function is specified. The listing describes an alarm that detects power failure, so it should not be treated as a temperature alarm.

Which Wi-Fi band does it support?

The listing specifies 2.4 GHz Wi-Fi and names Smart Life and Tuya for app notifications.

How long does its alert continue during an outage?

The listing claims up to 12 hours of alerting after an outage and says to charge it in an outlet for two hours first. That runtime is a manufacturer claim, not an independently verified result.

Are text and email notifications included?

The listing says app notifications are free, while additional SMS and email settings require a subscription.