The first security sensor with 8 detection functions in one compact design gives you ultimate flexibility to place anywhere inside your home for better protection. Get notified when a door is opened or closed, when motion is detected in your home, or even when a water leak is detected under the sink. Combine multiple detection functions through the Arlo Secure App for stronger security coverage. Protect your home with: Motion Detection Open/Close Detection Water Leak Detection Freeze Detection Tilt Detection Light Detection Smoke Listening1 CO Alarm Listening1 Only works with Arlo's Home Security System 2 Sensor Keypad Hub or 5 Sensor Keypad Hub.