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$68.99This sensor mounts on the interior or exterior of your home to monitor temperature. When temperatures dip below 39° F, the sensor contacts open sending a signal to the I/O Linc. Once signaled, the I/O Linc and/or Indigo can trigger INSTEON-controlled lights or appliances to turn on. Early notification can help prevent the use of irrigation and other systems that can create ice buildup. Learn More