105 DB LOUD ALARM - This Magnetic sensor window door alarm loud enough to detects entry, prevent kids and babies from going out of the house, protecting your home or office whether you are in or out, as soon as doors or windows are opened, the magnetic sensor will trigger the alarm to go off at 105 DB, which is super loud and can be heard throughout the house, office, and by your neighbours. ULTRA-SLIM DESIGN - Size: 2 x 1.5x 0.4 INCH, ultra-slim door and window alarm with 2 adjustable settings (on/off). Perfect for home, office, garage, dorm room, apartment, or even RV EASY INSTALLATION - Easily mounted by adhesive, tape it on the window or door then all done No wiring needed No screws needed Completely DIY REPLACEABLE B-ATTERY - Operated on 3 x 1.5 V LR44 Button Cells (Included) Life of B-attery around 1 year (if open once a day ) Easy Replacement of the cell by sliding b-attery cover. Easy Use Just Switch on at Night and switch off in the day."