Sharp alarm function: The power failure alarm is designed to provide immediate notification in case of power interruption. When connected in parallel with an outdoor wire or meter, the device will sound an alert if the wire is disconnected or the meter is damaged, offering a reliable warning system. Excellent stable performance: The automatic charging circuit of the power failure alarm is compatible with both standard and rechargeable batteries. When using rechargeable batteries, the standby life can last up to 10 years, helping to prevent false alarms caused by battery failure. Wide compatibility and operating voltage: The power failure alarm is designed to operate reliably within an AC voltage range of 175V to 265V. This wide voltage tolerance allows consistent performance in both urban and suburban areas, including locations with unstable power supply. The user-friendly design ensures long-term reliability and convenience. Long standby time and durability: The device uses two batteries—standard 23A batteries or rechargeable alternatives. Standard batteries last approximately 2 years, while rechargeable batteries can provide long-term operation and can be recharged for up to 10 years of service. Wide range of applications: Suitable for monitoring computer rooms, electrical distribution boxes, substations, and home electrical entry points, this alarm helps detect unauthorized disconnections or tampering with electrical wiring and equipment.