Zen Thermostat Wifi Edition, Volts:24 VAC,1 Year Battery Life (Using 4 Energizer Lithium L91AA Batteries, Included), Continuous Operation On C-Wire (If Present), Cool, Heat, Auto And Emergency Heat Modes, Multi Speed Fan Support, Programmable, Dims:7/8"H X 4-5/16"W X 4-5/16''L, Weight:7 Oz, In Mfg Box, Made In Thailand.**(Alt # ZZEN02W)**