The Honeywell CT87K is a white, round, non-programmable thermostat designed for heat-only systems. It is a corded electric device with a 2-wire wire configuration and operates on low voltage. The thermostat features temperature sensor technology, a mechanical control style, and is wall-mounted. Compatible with universal products, it has a display size of 3.15 inches and is programmable with a single heat stage. This unit is ideal for those looking for a simple and efficient heating solution for their home. Exact item is shown. New open box with its original packaging, which has some wear from storage and handling. 3.62" diameter x2.88" deep. For forced air, heat pumps without backup heat, hot water and steam. Does not work with 120V or 240V electric baseboard heat, multi stage heating and cooling, or heat pumps with backup heat. Includes the mounting hardware shown. Made in Mexico. No returns if installed. Please review our business policies in our store for information regarding returns, shipping and warranties.