[WIRELESS MAGNETIC SENSOR ALARM]: Alarm triggered after opening the front door or window. The alarm system will be activated when the door opens more than 0.6 inches. [SUPER LOUD ALARM]: 130 dB The alarm siren can not only cause a huge shock to thieves, but also wake you up during your sleep to avoid a horrible accident. [EASY TO USE AND INSTALL]: Wireless remote control, easy to use. Two installation methods, stick with double-sided sticker or tie it with strap, no tools required. It is suitable for homes, apartments, mobile homes, offices, hotel rooms, garages and other entry warning systems. [KEEP YOUR CHILDREN SAFE]: This magnetic wireless sensor door and window alarm is powerful enough to detect entry, lets you know when your children open doors or windows to prevent children and babies from going out, whether you are inside or outside the house. Especially, if you have a swimming pool at home, it is very necessary to install a door alarm. [DON'T WORRY ABOUT NOT WORKING]: The burglar alarm can be used for a year without frequently changing the battery. When the battery voltage is lower than 2.1V, a beep sounds. Don't worry about it not working.