Function: Power off and restore the alarm, sound indicates power failure and power-on. 118 decibels: 118 dB siren sounds; alarm continues until manually disabled or battery is depleted. LED light: LED flashing provides visual alert during power failure. Manual control: Alarm can be manually turned off after activation. Power: Requires one 9V battery (not included). Working voltage: 110-220V Plug Type: US Plug, compatible with outlets in Canada, India, Mexico, Thailand, Taiwan, the Philippines, and other countries using US standard plugs. Voltage: AC 100-240V Quantity: 1 Pack Color: White Material: Plastic Package Contents: 1 x Power Failure Alarm Note: Only the items listed are included. Light reflection and display differences may cause slight color variation between image and actual item. Measurement error allowed within +/- 1-3 cm.