Connect the power supply, display instructions humidity Set the starting humidity: press the UP button to display the starting humidity, press and hold for about 3 seconds to start the humidity flashing, then press UP or DOWN to adjust the setting. Set stop humidity: press the down button to display the stop humidity, press and hold for about 3 seconds to stop the humidity flash, then press UP or DOWN to adjust the setting. Restore factory settings: Press UP and DOWN at the same time, 888 will be displayed, then the humidity will be detected automatically. Specification: Model: XH-W3005 Humidity range: 00%~99%RH Humidity control accuracy: 0.1% RH Measurement accuracy: +/- 2% RH Load power: 12v 120w or 24v 240w or 220v 1500w (depending on your choice) MAX output: 10A Output type: direct output Size: 60* 45 * 31 mm Package Include: 1 x XH-W3005 Digital Humidity Controller AC 220V Humidity Control Switch