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:110-220VPlug Type:US Plug, it applies to Canada, India, Mexico, Thailand, Taiwan, the , the Philippines and so on.Voltage:AC100-240VQuantity:1 PackColour:WhiteMaterial:PlasticPackage Contents:1 * Power Failure AlarmOnly 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.