Keep tabs on every door, window and hallway with your Motion + Entry Sensor Home Security System. The hub-free, app-controlled sensors work together with other Kangaroo Sensors to create the perfectly customized security system for your home. Get an instant phone notification when your protected door or window is opened and someone passes through the threshold. For even more security, pair these sensors with our Siren and subscribe to Kangaroo Complete for professional monitoring. This system includes 4 Motion + Entry Sensors and a bonus Yard Sign as your first line of defense.