DIGITAL NON-PROGRAMMABLE THERMOSTAT,1-HEAT,LARGE EASY-TO-READ DISPLAY,RELAY OUTPUT FOR COMPLETE 24-VOLT HEATING SYSTEM COMPATIBILITY,MILLIVOLT COMPATIBLE,TEMPERATURE CONTROL RANGE:45DEG F.- 90DEG F,(7DEG C.- 32DEG C.),DC POWER:3.0 VOLT(2 AA ALKALINE BATTERIES NOT INCLUDED)SYSTEM CONFIGURATIONS:2-3 WIRE GAS,OIL,OR ELECTRIC HEATING SYSTEMS,TERMINATIONS:R,W,G.SWITCHING:SYSTEM:ON-OFF,FAN:AUTO-ON, Being sold as new and unused with no warranty or guarantee.