brand new and high quality Specifications: LED Display: Red Light or Blue Light, random delivery Moisture range:00 percent -99 percent RH Humidity control precision:0.1 percent RH Measuring Accuracy: 2 percent RH Load Power: 110V-220V MAX Output: 10A Output type:Direct output Instructions : 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 for time , will display 888 then will Automatically detect the humidity Package include: 1 x Digital Humidity Controller 1 x Humidity sensor