The Mini Door & Window Alarm installs in seconds on any door or window in your home or office. Using magnetic connectivity, the Mini will emit a 90-decibel siren should someone try to enter a door or window you have protected. Installation is a snap – simply use the Peel & Stick tape included on your alarm to attach it to most doors and windows. Compact and easy to use, the Mini Door & Window Alarm provides affordable protection at home, campgrounds, dorms, and more. Features: 90-decibel Ear Piercing Alarm Easy Installation – No Wires Required Can be used with most doors & windows Compact size can be used with cabinets, closets & drawers Item Dimensions: Main Unit— 1.2" x 2.4" x .8", Magnet Sensor— 2.2" x .4 Requires 3 AG13 Button Cell Batteries (included) Includes 1—1.83" x 1.5" Security Sticker For indoor use ONLY.