Check the listing for details. 6 Pack Window Alarm Door Magnetic Sensor for Home Security System, 6PCS. Color: 6PCS, Condition: New. Listed at 18.70 USD. 6 Pack Window Alarm Door Magnetic Sensor for Home Security System, 6PCS Product Details Color: 6PCS Brand: CaoXiong Power Source: Battery Powered Compatible Devices: Home Security System Battery Description: Alkaline Big LOUD ALARM :door window sensors loud enough to detects entry, prevent kids and babies going out the house, protecting your home office, garage, dorm room, or apartment whether you are in or out. You can definitely hear it from another room to alert you. No worry the young children could mess with it, just have it up high where they can't reach it. Work on sliding doors, windows, drawer, fridge. SMART DESIGN :The alarm and magnetic stripe are separated more than 0.39inch(10mm), it keeps going off until you close door(make them connection) or turn it off(switch to the button "OFF"). Prevent kids and babies going out the house without notice. Protect your house from thiefs break in your house's windows and doors. EASY INSTALLATION :Wipe the flat surface, peel off sticker, mount the alarm on door and magnetic stripe on door frame. Done! Easily mounted by adhesive. Type to window or door. Ideal entry warning for homes, apartments, mobile homes, offices, hotel rooms, garages, and more!