Additional Nest detect sensor for the Nest secure alarm system. Keep track of more doors, rooms and windows. One sensor can detect two things: when a door or window opens and when there’s motion in a room. Stick it on a door. You’ll know when it opens and closes and if there’s motion in the room. Stick it on a window. You’ll know when it opens and closes. Stick it on a wall. You’ll know when there’s motion in a room. Open quietly. When the house is armed, just press the button to open a door. The alarm stays quiet and the house stays armed.FEATURES If your Nest secure is armed, the alarm will sound Turn on dog pass so your small dog can move around freely without setting off the alarm Walk by Nest detect at night and pathlight helps you find your way in the Dark It’s easy to install yourself - no drilling holes or connecting wires The Nest app helps you set up Nest detect and Nest guard. And shows you where to place it on doors, windows and walls