LCD Electronic Temperature Controller - This device is operable from a distance of up to 400 feet and has a superior accuracy for pinpoint temperature control of -30 °F to 220 °F. This digital display is easy to read and a pushbutton control allows you to choose selectable heating and cooling modes. It is not easy to find all these features in such an inexpensive monitor. A keypad lockout provides tamperproof protection. EEPROM memory retains control settings during power outage. This is an OEM product for some of the largest industrial chiller & heater manufacturers. Outperforms other thermostats which cost substantially more.