Connect the power, display the humidity indicator. Set Initial Humidity: Press the UP button to display the initial humidity, press and hold for about 3 seconds to start the humidity flashing, and then press UP or DOWN to adjust the setting. Set Humidity Stop: Press the down arrow to display the humidity stop, press and hold for about 3 seconds to stop the humidity flashing, and then press UP or DOWN to adjust the setting. : Press UP and DOWN simultaneously, display 888 and automatically detect humidity. Model: XH-W3005 Humidity Range: 00%~99%RH Humidity Control Accuracy: 0.1% RH Measurement Accuracy: +/- 2% RH Load Power: AC 110-220V 1500w Maximum Output Current: 10A Output Type: Direct Output Size: 60x45x31mm Material: Metal + Plastic Color: As Shown Package Contents: 1 * Humidity Controller Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture to be a little different from the real thing. The allowed measurement error is +/- 1-3 cm.