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 alert you if the wire is disconnected or the meter is damaged, offering a warning signal for potential hazards. 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 range: Designed to operate reliably within an AC voltage range of 175V to 265V. This ensures long-term functionality and makes it suitable for use in both urban and suburban areas where voltage fluctuations may occur. The thoughtful design offers added convenience. Long standby time and durability: Powered by two batteries, including standard and rechargeable options. Standard batteries last approximately 2 years, while rechargeable batteries offer extended service life and can be recharged for continued use over a period of up to 10 years. Wide range of applications: Suitable for monitoring computer rooms, electrical distribution boxes, substations, home electrical entry points, and similar locations, helping detect unauthorized disconnection of power lines or tampering with electrical equipment.