Ready to protect, right out of the box Easy to install on every type of door or window. The magnet goes on the door or window, and the sensor goes on the frame (or vice versa). Magnet can be placed up to 2 inches from the sensor, so sensors fit on all types of doors and windows. SimpliSafe sensors come with the battery pre-installed and adhesive tape pre-applied, making set-up a snap. Watch every door and window The majority of burglars break in through a door or window. Our super-small Entry Sensor was designed with a tiny magnet to detect when one opens. With professional monitoring, it alerts our monitoring center who will dispatch...