Easy to program. Ac and heat, heat pump. th4110u2005 2120. Serial number in pic. Obviously working. Have 2. Not wifi. Set time on, leave, arrive, sleep. Temp for each set. Mon thru Friday then Sat and sun are the same settings. Obviously has hold feature. Shows desired temp and actual. T-SERIES T-4 THERM 1H/1C Product Dimensions. 1.13"D x 4.06"W x 4.06"H. Wall mount 6"w by 5" tall
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