1.You can pre-set it siren or silent according to your need in case that your window or door is opened illegally. 2.It will Recycling redial your pre-set 6 groups of Tel No. at first time when a theft happen . 3.By telephone, you can make it arm (disarm) ,siren, silent and here what happen . 4.Can work with gas leakage alarm, smoke alarm, PIR detector , wireless door/window detector, emergent button, wireless controller, ect. 5.With UPS power supply or rechargeable battery support , make it work for 48 hours under the situation of no electricity . 6.With 5 ,6, 8, 16, 32 defense zones , 90 address zones for your choose .