It is a small device installed on the window and door and when trying to open them, a high warning alarm bell is issued that can be stopped and operated from the inside only protect the house: Now you can sleep completely safe and know that someone will wake you up if someone tries to enter your home or if you forget the window or door is unsealed completely safe from every hazard. Protect your child: You can install it on the refrigerator door or any drawer or balcony that your child fears. When you try to open the refrigerator, drawer, cupboard or balcony, a loud alarm will be issued. This product will be an excellent pick for you.