... Max 1P). Switch between C and F, temperature controlling, auto and manual defrosting STC-500 Microcomputer Temperature ControllerMain functions:Intelligent control compressor ... 1P). Switch between °C and°F, temperature controlling, auto and manual defrosting, light control, dual control of temperature and time when defrost ends, ... 1~60 minutesLight control STC-500 All-purpose Temperature Controller