||Device is designed for frost protection of big ground areas and roof rain water systems. In ground areas, a sensor pair ECOA901+ECOA902, which both must be installed into the ground, controls the heating and in rain water systems a sensor pair ECOA903+ECOA904. ECOA903 must be installed into gutter and ECOA904 into open air. Sensors are delivered separately. User can set up from the screen the frost protection rules, language settings, monitor hour meter, set up post heating and manual heating.