Main functions: AH Afterheating/thermostat; Password protection; LOAD Tank heatingOCEM Collector emergency shutdown; OCCO Collector cooling; OCMI Collector minimum temperatureOCFR Antifreeze; OTCO Tube collector; PUMP Pump control mode; OSYC System cooling; OSTC Tank cooling; MAN Manual modeBLPR Blocking protection; OTDI Thermal Disinfection; UNIT C-F switchBEEP fault warning; Memory function; Screen protection; checkingTECHNICAL DATASize of Controller:178mm x120mm x43mmPower supply:AC100-240V,50-60Hz.Power consumption: Less than 2.5WAccuracy of temperature measuring: 0.1CRange of collector temperature measuring: -10C ~220CRange of tank temperature measuring: 0C ~110CSuitable power of pump: 1 pump possible to be connected, output power Less than 300W .Suitable power of (backup heating): 1pc 500W .Inputs: 3 sensors,1pcs*Pt1000 sensor (500C) for collector (silicon cable280C),2pcs*NTC10K, B3950 sensor ( 135C) for tank, (PVC cable 105C),Outputs:2 relays, for circulation pump and backup heating temperature:-10C ~ 50C.Water proof grade: IP41Plug Type:EU Plug,it applies to Indsia, , , , and so onVoltage: AC100-240Vcolor:As shownMaterial:plasticPackage Contents:1 x SR208C Solar Water Heat Controller(Wifi) the above package content, other products are not included.Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.