[ALARM TRIGGERED BY WIRELESS MAGNETIC SENSOR]: Alarm triggered after entrance door or window is opened. The alarm system will be activated when the door opens more than 0.6 inch. [SUPER LOUD ALARM]: 130dB Siren alarm not only can cause huge shock to thieves, but also allows you to wake up while sleeping to prevent horrible accident. [EASY TO USE AND SETUP]: Wireless remote control, easy to use. Two installation methods, stick with double-sided sticker or bind it with strap, no tools required. It is suitable for homes, apartments, mobile homes, offices, hotel rooms, garages and more entry warning systems. [KEEP YOUR CHILDREN SAFE]: This door alarm and magnetic wireless sensor window is strong enough to detect entry, it lets you know when your kids open the doors or windows to prevent children and babies from going out, whether you are indoors or out. exterior of 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< /p>