automatic power cut failure alerter led indicator smart 120db outage alarm warning siren, needs 9v battery (not included) sonew features:<br> led indicator shows power out / failure alarm and power condition. the siren alarms when the power supply is cut off until restore power. the warning could be manual muted by on/off switch. drawer-type cell cover design, can change the battery easily. high voltage resistant design, works fine even when power voltage exceeds standard. <br> specification:<br> plug: cn plug<br> voltage: ac 220v<br> color: color<br> battery: 1pcs x 9v battery (not included)<br> alarm volume: 120db<br> cable length: approx. 85cm/33.5inch<br> size: approx. 10*5.3*2.5cm/3.9*2.1*1inch<br> weight: approx. 100g / 3.5oz<br> <br> package list:<br> 1 x power failure alarm<br> <br> note: please kindly make a note if you need any plug adapter.<br>