The siren alarms when the supply is cut off until is restoredThe warning can be manually silenced by the on / off switchDrawer type cell cover design, you can easily change the batteryHigh voltage resistant design, works well even when supply voltage exceeds standardLED indicator shows off / fault alarm and statusPlug Type:US Plug,it applies to Canada, India,Mexico, Taiwan, Thailand, the United States, the Philippines and so on.Material:ABScolour:whitePackage Contents:1 * AlarmOnly the above package content, other products are not included.Note: Light 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.