SmartThings SmartSense Open/Closed Sensor Receive immediate alerts if windows, doors, or drawers open unexpectedly Trigger lights to turn on or an alarm to sound if there's unwanted home entry or access to items Monitor and secure dangerous, valuable, or off-limit areas inside your home Trigger smart lights to automatically turn on when you open the front door, and off when you close it behind you Monitor temperature in Fahrenheit or Celsius and trigger your smart thermostat, or an A/C unit or portable heater to adjust if temperatures fluctuate