Function: Power off and restore the alarm, the sound of power failure and power-on alarm. 118 decibels: 118 decibel siren sounds, keep the alarm until it is closed or the battery is exhausted. LED light: LED flashing allows you to see alerts far . Flinting only when the power is turned off. Manual control: You can manually turn off the alarm after receiving the alarm. Power:1 section 9V battery (excluding) Working voltage:110-220V Plug Type:US Plug, it applies to Canada, India, Mexico, Thailand, Taiwan, the , the Philippines and so on. Voltage:AC100-240V Quantity:4 Pack Colour:White Material:Plastic Package Contents: 4 * Power Failure Alarm Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.