Home Power Failure Alarm, High Volume Power Failure Warning, Automatic Fault Detection Alarm Sharp alarm function: This power failure alarm is designed to alert users in case of a power outage. When connected in parallel with an outdoor wire or meter, the device will immediately sound an alarm if the circuit is interrupted or the meter is damaged, providing a timely warning. Excellent stable performance: The automatic charging system supports both standard and rechargeable batteries. When using rechargeable batteries, the standby life can last up to 10 years, helping prevent false alarms caused by battery failure. Wide compatibility and operating voltage: Designed to operate reliably within an AC 175V to 265V range, this alarm is suitable for use in both urban and suburban areas, including locations with unstable voltage supply. Long standby time and durability: Powered by two batteries, it works with standard GF23 batteries or rechargeable options. Standard batteries last approximately 2 years, while rechargeable batteries offer long-term use and can be recharged for up to 10 years of service. Wide range of applications: Ideal for monitoring computer rooms, electrical distribution boxes, substations, home electrical entry points, and other critical power connections, helping detect unauthorized disconnections or theft of electrical wiring and equipment.