[MAGNETIC WIRELESS SENSOR TRIGGERED ALARM]: Alarm triggered after the entrance door or window opening. The alarm system will be activated when the door opens more than 0.6 inches. [SUPER LOUD ALARM]: 130 dB siren alarm can not only cause a huge shock to thieves, but also wake you up in your sleep to prevent a horrible accident. [EASY TO USE AND INSTALL]: Wireless remote control, easy to use. Two installation methods, stick with double-sided sticker or bind it with a strap, no tools required. It is suitable for homes, apartments, mobile homes, offices, hotel rooms, garages and more entry alert systems. [KEEP YOUR KIDS SAFE]: This magnetic wireless sensor door and window alarm is powerful enough to detect entry, it lets you know when your children open the 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. Note: Batteries are not included, batteries need to be purchased by yourself