This anti-theft door stop alarm can be easily installed, you just need to stick the alarm sensor on the window or door, and the installation is complete, it can also be used as a door stop alarm, pool door alarm, garage door alarm or sliding door Alarm system. Magnetic trigger, when children, the elderly and patients with dementia open or indoor doors, the alarm sounds, which can prevent any accidents, keep young children and the elderly away from cupboards, ground swimming pools, monitor wandering, sleepwalking, etc. This door alarm instantly detects any movement of doors and , now you can stop intruders with our ultra-powerful alarm system. The anti-theft design may be slightly louder for children, so remember not to scare them. Colour:White Material:Plastic Package Contents: 1 * Smart Door Window Alarm Sensor Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.