EASY TO SEE: Our in-wall humidity sensor & fan control uses LCD screen, displays real-time humidity value. It is easy for you to view and manage the humidity level of the bathroom. The button can also be locked to avoid touching by mistakeAUTO/MANUAL MODE: When set to automatic mode, it can automatically detects the humidity in the room and turns on the bathroom fans, it will automatically stop when the moisture value you set is reached. When set to manual mode, press ''M '' button, you can turn on the fan; Press ''M '' button again, the fan can be turned off or run 1 min to automatically turn offNO DISTURB AT NIGHT: Are you still worried about that the loud exhaust fans at night will cause you to have trouble sleeping? Our wall humidity sensor switch for bathroom fan can manually set the time off fan operation at night about 4-16h, enough time to ensure you a good night's sleep. And will return to automatic mode when the time arrives, you no longer need to manually set, make your life more healthier and easierDEHUMIDIFICATION FUNCTION: Our humidity sensor fan switch uses a microprocessor combined with the advanced digital sensing technology. To detect the humidy level in the bathroom and automatically turn on the exhaust fan for ventilation, keep your bathroom dry and clean, creating a healthy environment for you and your family. It also has humidification function. When the weather is dry, it can be used by connecting the humidifierWIDE APPLICATION: The moisture sensor switch are perfect for bathrooms, laundry rooms, basemenst, garage, pantry or any other location high levels of humidity. The humidifying function can be used in your bedroom, living room, etc. When in non-operating mode, the blue light will turn off, you no longer worry about it will trouble you. Support 110/220V, neutral wire is requiredNEW GENERATION: We update a critical opition for minimum run time, you can setting for how long the fan runs in auto/manual mode, default time is 1 min (1 min - 60 min)