HIGH ALARM VOLUMEWhen the power is cut until the power is restored, the power failure alarm alarm, the alarm volume is up to 120 dB or more, the warning can be manually of the mute. The warning could be manually muted by the on/off switch.LED INDICATOR DISPLAYPower failure alarm is designed with LED indicator, which shows power out / failure alarm and power condition. When the power is cut, the siren alarm will sound until the power is restored. With a high voltage resistant design, it works fine even when power voltage exceeds the standard.REPLACEABLE BATTERYFailed circuit alarm adopts drawer battery cover design, which can easily replace the battery, and use normal batteries (DC9V). Please note that this product does not provide batteries.WIDE APPLICATIONPower failure alarm for freezer, widely used in telecom room, hospital, farm, industrial and mining enterprises, refrigerators, institutions, substations, etc. As a power failure warning, the power failure reminds the product.