Home Power Failure Alarm, High Volume Power Failure Warning and Detection Alarm with Automatic Fault Alert. This alarm is designed to notify you immediately in the event of a power outage or if the connected line is disconnected or damaged, providing an ble alert for added safety. Excellent and stable performance: The power failure alarm supports 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 voltage compatibility: Designed to operate reliably within an AC 175V to 265V range, this alarm is suitable for use in both urban and suburban areas where voltage fluctuations may occur. Its durable design ensures long-term functionality under varying electrical conditions. Long standby time and durability: Powered by two batteries, it offers approximately 2 years of operation with standard batteries, while rechargeable options provide extended service life and sustainability over time. Wide range of applications: Ideal for monitoring computer rooms, electrical distribution boxes, substations, home electrical entry points, and other critical power locations to help detect unauthorized disconnections or theft of electrical supply.