Sharp alarm function: power failure alarm is mainly used for power failure alarm. When the alarm is connected in parallel with outdoor wires or meters. If a line is broken or a meter is damaged, the product will report it to you immediately. Provides a warning alert. Excellent stable working performance: The flow automatic charger of the power failure alarm can use ordinary batteries and rechargeable batteries; when using rechargeable batteries. The standby life can reach 10 years. Prevents false positives that go undetected due to battery failure. Wide compatibility and applicable voltage: The exquisite design of power failure alarm makes this product can be used for a long time under the voltage of AC175V~265V. The compatible design can be used not only in urban areas. And also in suburban areas with unstable voltage. Humanized design brings you great convenience. Long standby time and durable: power failure alarm uses two batteries. Ordinary GF22 batteries and rechargeable batteries. Ordinary batteries can be used for about 2 years. And the rechargeable battery can be used for a long time. The rechargeable battery can be recycled for about 10 years. Wide range of applications: power failure alarm is suitable for monitoring computer rooms. distribution box. substation. Household electrical wiring entry. Etc...and can place stolen wires or appliances. "