HEATING/COOLING SUBBASE, VOLTS:24

HEATING/ COOLING SUBBASE, VOLTS: 24, FUNCTION: SYSTEM SWITCH - COOL/OFF/HEAT, FAN SWITCH: ON /AUTO, DIMS: 2-7/8"H X 2-5/8"W X 13/16"D, WEIGHT: 1.4OZ, USE WITH  T199B(THERMOSTAT) ** NOT INCLUDED**,  ORIGIN: USA, MFG BOX,