New! Unused! ProStat Universal Programmable Thermostat PRS4210

New! Unused! ProStat Universal Programmable Thermostat PRS4210 Economy Universal Programmable Thermostat 2 Heat / 1 Cool Conventional or Heat Pump Compatibility: Single-stage conventional or heat pump systems Multi-stage heat pump systems Multi-stage conventional systems 2-wire hydronic zone systems 250mv - 750mv millivolt heating systems Product Features: 7 Day, 5-2 Day or Non-Programmable Large 2 sq. in. display with bright blue backlight Adjustable temperature limits for multi-family housing Hardwire or battery powered Permanent memory retains settings Filter check monitor Adjustable temperature differential Adaptive Recovery Mode (ARM™) ESD Guard™ electronic circuitry Compressor short cycle protection Temporary program override Programmable extended hold mode Front access reset button F° / C° switch ROHS Compliant Trilingual packaging and instructions