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Style:Door/Window Sensor The contact sensor, 2 pk gives additional security to your home security system by iSmartAlarm. The sensors are removable, movable and easily placed at any door or window. They instantly notify you when the door or window is open. These sensors are part of a self-monitored, self-controlled wireless security system with no monthly fees or contracts required. The iSmartAlarm app allows you to arm, disarm and monitor your security system from your smartphone. If you are looking to add security to your DIY home security system, these contact sensors will give you the protection you need.