Take your security beyond video monitoring with a Window / Door Sensor Set from Lorex. Small, but incredibly crucial, this sensor will notify you the moment a window or door has been opened. Simply stick the sensors on any door or window frame in your home. Then, the moment that their close connection is broken you will be notified through the Lorex Home App. Connect a total of 10 sensors to the to ensure you always know of any suspicious openings of any windows or door openings.