Description: Alarm of power failure is also called power failure alarm and engine room power failure alarm. If the power grid is cut off or the power cable is interrupted, the alarm will immediately turn on and will not turn off do the time the power is restored or the battery is depleted. In a computer room, electrician on-call, power company, etc. can also be used in households do monitor the burglar alarm in case of theft of wire and cable. The power indicator of this product can at first glance check the power supply status of the power grid; the high voltage resistant design can work for a long time at 260V, even if in the middle of the night the mains voltage exceeds the norm, it is not easy to damage; the drawer battery cover can be conveniently switched, and the battery can be easily replaced; Both ordinary batteries and accumulators can be used in the automatic flow charger; when using batteries, the standby time is do 10 years, which prevents the failure of false alarms caused by battery failure. . ALARM NO POWER SUPPLY 220V . ALARM NO POWER SUPPLY 220V . ALARM NO POWER SUPPLY 220V 2. Alarm mode: It can signal with a whistle if the network is cut off or the power cable is cut until do power is restored. 3. Monitoring voltage width: AC175V~265V, a wider range of applications, not only for cities, but also for remote villages where the supply voltage is extremely unstable. 4. Alarm too low battery voltage: prevents false alarms caused by failure to detect battery failure. 5. Battery Replacement: The drawer type battery cover switch is convenient and can be easily replaced. . ALARM NO POWER SUPPLY 220V . ALARM NO POWER SUPPLY 220V . ALARM NO POWER SUPPLY 220V Material: ABS Color: shown as picture Battery model: DC9V (1 GF22 battery) Monitoring voltage: AC175V~265V. Operating voltage: DC9V (1 GF22 battery not included). Alarm volume: 115 decibels. Operating environment: temperature -30C ~ +60 Relative humidity: 85% RH. Package weight: about 74 g/2,6 oz. ALARM NO POWER SUPPLY 220V . ALARM NO POWER SUPPLY 220V . ALARM NO POWER SUPPLY 220V Note: If it is used in Europe, be sure to add a European adapter. . ALARM NO POWER SUPPLY 220V . ALARM NO POWER SUPPLY 220V . ALARM NO POWER SUPPLY 220V