Dometic Single Control Kit LCD Cool Furnace Thermostat 3313189.015 Black Digital Replacement Kit for Analog Thermostat 3106995.032 Fits 540, 4579, 4595 and 640 Air Conditioner Series Units Digital temperature calibration maintains room temperature +/- 2 Auto fan will vary to maintain even room temperature Easy touch click response buttons let you know when you make a change on the control panel