Jenix Wireless Door Window Open Alert Alarm Home Security System Siren - Set of 4 Nos Sensors JXDMA06 Jenix Window Door Magnetic Sensor with Inbuilt Siren:  nstallation with adhesive tape, just stick on and go. tach the main unit and magnet unit on door/window and door/window frame, keeping them in horizontal alignment, then turn on the switch, when the two parts separate the alarm will generate loud alarm sound to inform there is a intruder. Work as an anti-theft alarm, alarm vol up to 80dB. an be used in doors, windows, cabinets, drawers to detect intruders. mpact size, a perfect kit for your home and office security system. hen You are at home just switch off device so that it will not sound again and again when door or window is opened r>ificationbr>ial: PPin Unit Size: Approx. 9. 2x3x2cm/3. 62x1. 18x0. 79 inchgnet Unit Size: Approx. 5x1. 5x1cm/1. 97x0. 59x0. 39 inchwer: 3 piece AAA battery (Included). r>