Wireless Home Security Door Window Alarm Magnetic Detector ,120 DB volume alert will warn you the door or window is opening. Easy to install, including double-sided tape, no wiring or screws needed, just simply tear the tape and paste it. It will be a perfect choice for your family, office ,apartment,garage .etc. Powered by 3* Batteries(included),usually it can standby for 12 months.Low battery indicator will inform you to change battery. Instant alarm reminder,the alarm will be triggered and alarm immediately when someone opens the door ( the minimum trigger distance is 1 cm) Not only can it be used to protect your family's safety, it also can be used to remind the forgetful old people that the doors and windows are not closed, and can even be used to prevent children from leaving the house without inform.
The siren alarm will be triggered immediately once the two parts are separated. 120 DB loud alarm will be benefit to inform homeowner/neighbor when visitor/kids/pet or someone is opening the door/window.