1.[Wireless Magnetic Sensor Alarm]: The alarm is triggered after opening the front door or window. When the door is opened more than 0.6 inches, the alarm system will be activated. 2.[Super Loud Alarm]: The 130 decibel siren can not only cause a huge shock to thieves, but also wake you up when you are sleeping to avoid terrible accidents. 3.[Easy to Use and Install]: Wireless remote control, easy to use. Two installation methods, stick double-sided stickers or tie with tape, no tools required. Suitable for houses, apartments, mobile homes, offices, hotel rooms, garages and other entrance warning systems. 4.[Protect Your Children's Safety]: This magnetic wireless sensor door and window alarm is powerful enough to detect the entrance and let you know when your child opens the door or window to prevent children and babies from going out, whether you are indoors or outdoors. In particular, if you have a swimming pool at home, it is very necessary to install a door alarm. 5.[Don't worry about not working]: The anti-theft alarm can be used for one year without frequent battery replacement. When the battery voltage (2 AAA batteries included) is lower than 2.1V, a beep will sound. Don't worry about it not working.