Moisture range:00%~99%RH Humidity control precision:0.1% RH Load Power: 1500 W Output type: Direct output – Relay Size: 60*45*31 mmnstructions : Connect to power supply , display Instructions humidity Set start the humidity: Press the UP button display start the humidity , long press about 3s the start the humidity flashing , then press the UP or Down adjust the set Set to stop the humidity: Press the Down button display Stop the humidity , long press about 3s the Stop the humidity flashing , then press the UP or Down adjust the set Restore the factory Settings: press the UP and Down button at the same time , will display 888 then will Automatically detect the humidity Package include ; 1pcs Digital Humidity Controller 1pcs SHT20 Humidity sensor