Samsung SmartThings Multipurpose Sensor Only $16.99 Shipped (Regularly $40)
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UPDATE: It appears the price for Amazon Prime Members is now $19.99.
This multipurpose sensor is easy to install and pairs with your SmartThings hub and your Apple iOS, Android or Windows mobile device. You can be alerted for everything from a knock on the door to your laundry done. Plus, the sensor even monitors the temperature and triggers your thermostat to adjust accordingly. Note, a Samsung SmartThings Hub is required for use.