SimpliSafe Smart Indoor Water Sensor, Wi-Fi Connected, Wireless (Battery) - White (1-Pack)

Detects motion within 30 ft. The sensor has a 90° field of vision, giving you a full range of coverage when placed in a corner. The sensor is shaped to stand on a shelf, adhere to a wall, or fit in a corner for maximum room coverage. Set the sensor to be active only in away mode (so that you won't trigger it when you're at home) or both home and away modes (for rooms that you want covered with a motion sensor while you're home).