resideo Thermostat With Redlink 3.0, S1100 Series, 20-30 V, 0.09 A, Black, 5 to 90% RH Humidity Rating, +/-5% RH Accuracy, Touchscreen Display, 60 Hz, 50 to 99 deg F Cool, 40 to 90 deg F Heat Temperature Settings, 2 Heat/4 Cool Conventional or 4 Heat/2 Cool Heat Pump Stages, Junction Box, Wall Mounting, 37 to 102 deg F, 3.54 in H x 5.25 in W x 0.96 in D, Automatic or Manual Changeover