Sensors are the key to home automation. These are the triggers that make things happen automatically. They can be lifestyle based (door/window sensor turns on/off a closet light. Motion sensor detects no movement in the home and turns a light off) or they can be security based (Flood sensor triggers alert to your phone and shuts off the water leak caused by a faulty washing machine. Motion sensor triggers siren, and sends a notification for the user to view the camera). Z-Wave sensors have long battery life and are very unobtrusive.