Sharp alarm function: Power failure alarm is mainly used for power failure alarm. When the siren is connected in parallel with an outdoor wire or meter, if the wire is disconnected or the meter is damaged, the product will immediately report to you and provide a warning prompt. Danger. Good stability: The power failure alarm flow automatic charger can use ordinary batteries and rechargeable batteries; when using rechargeable batteries, the standby life can reach 10 years, which can prevent false alarms that are not detected due to battery failure. Wide Compatibility and Application Voltage: The exquisite design of the power failure alarm allows the product to be used under AC175V~265V voltage for a long time. Compatible designs can be used not only in urban areas, but also in suburban areas with less stable voltages. Humanized design brings you great convenience. Long standby time and durable: The power failure alarm uses two batteries, ordinary GF22 battery and rechargeable battery. Ordinary batteries can be used for about 2 years, while rechargeable batteries can be used for a long time. The rechargeable battery can be recycled for about 10 years. Wide range of applications: The power outage alarm is suitable for monitoring computer rooms, distribution boxes, substations, household wire entrances, etc., where stolen wires or electrical appliances can be placed. Note: This product is a Chinese national standard plug (without adapter)