WIRELESS MAGNETIC SENSOR ALARM: Alarm triggered after opening the front door or window. SUPER LOUD ALARM: 130dB Alarm Siren not only can cause a huge shock to thieves, but also let you wake up while sleeping 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 entrance warning systems. KEEP YOUR CHILDREN SAFE: This wireless sensor magnetic door and window alarm is powerful enough to detect entry, let you know when your kids open doors or windows to keep children and babies 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. Door magnetic battery: No. 7 battery * 2 Remote control battery: CR2032 section * 1 does not contain Package size: 9.1 x 4.8 x 3.4 cm.