Magnetic Sensor Home Door Window Entry Warning Alarm Switch (Door Window  Alarm)
Package Content: 1 x Magnetic Door Sensor (2 parts ), 4 x Screw Nail;Suitable to used in apartment, hotel, office, etc;The Entry Alarm adopts magnetic sensor design to detect any entry from door or window;Once the two part of this alarm set is separated, it will warning you somebody is coming in with loudly and harsh sound