[Electromagnetic wireless sensor alarm]: Triggers an alarm when an entrance door or window is opened. When the door is opened more than 0.6 inches, the alarm system will be activated. [Super strong alarm]: A 130 decibel alarm can not only cause a huge shock to thieves, but also wake you up while sleeping to prevent terrifying accidents from happening. [Easy to use and install]: Wireless remote control, easy to use. There are two installation methods, using double-sided stickers or straps, without the need for tools. It is suitable for homes, apartments, mobile homes, offices, hotel rooms, garages, and more entry warning systems. [Protecting Children's Safety]: This magnetic wireless sensor door and window alarm has powerful functions, which can detect entrances and let you know when children open doors and windows to prevent children and babies from going out, whether you are indoors or outdoors. Most importantly, if you have a swimming pool at home, it is necessary to install a door alarm. [Don't worry about not working]: The anti-theft alarm can be used for a year without the need for frequent battery replacement. When the battery voltage (including 2 AAA batteries) is below 2.1V, a beep sound will sound. Don't worry about not being able to work.