[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]: 130dB Alarm Siren can not only 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. [DON'T WORRY NOT WORKING]: The burglar alarm can be used for one year without changing the battery frequently. When the battery voltage (including 2 AAA batteries) is lower than 2.1V, a beep sounds. Don't worry about it not working. Note: The data is all manual measurement, please allow 1 - 3cm error, due to the light and display difference, there are will have some color difference, depending on the physical object received Delivery Quantity: (according to the main picture)