... you facilitatively open the door at night; 9.When batteries are replaced, the alert will set off. ... and the door is opened normally, please replace batteries in time;10.Having a direct window, ... , when the battery is fully depleted, available 9 V battery power Open; 12.Light touch slide ... degree 10.Working voltage4 sections, 1.5V alkalescency batteries, or 6Vdirect current11.False Rejection Rate(FRR)≤ 0 ...