Low power consumption, A regular 9V battery lasts for the whole season. Gives loud 85dB alarm sound Working temperature:0~35

In addition to a decoration of the Christmas tree,the Ball is designed to serve as an extra warning device in addition to the regular smoke alarms.Low power consumption,A regular 9V battery lasts for the whole season. Gives loud 85dB alarm sound.Working temperature:0~35.The relative humidity:10~85

Christmas Tree Ball(Heat detector)