Reliance Controls THP217 Automatic Phone-out Freeze Monitor
Reliance Controls' THP217 Automatic Phone-out Freeze Monitor automatically calls up to 5 programmed phone numbers when temperature drops below 42 degrees F. Keypad base unit plugs into phone line and electrical outlet, and the internal temperature sensor continually monitors your home while you're away.  This Freeze Alarm will dial up to 5 numbers anywhere in North America when problem occurs.