This Philips humidifier offers a three-stage, advanced evaporation system with NanoCloud technology. Stage 1: The humidifier's absorbent filter captures large particles such as human/animal hair and dust when dry air is drawn in. Stage 2: Advanced evaporation technology ensures that neither bacteria nor lime can settle, and humidifies the air by adding water molecules to the air. Stage 3: Clean air is blown out of the humidifier at a constant speed. So this product offers a comfortable and healthy humidification without haze formation in your home. Uniform distribution of humidified air throughout the room. Breathe and sleep better at home with clean, humidified air. The Philips humidifier allows you to choose between 40, 50 and 60 percent humidity for maximum comfort. Automatic mode uses the digital sensor to continuously monitor humidity. It turns your humidifier on and off as needed to maintain a constant humidity level. Red light indicator warns you when the container needs to be refilled. When the water tank is empty and needs to be refilled, the lock function turns off the humidifier to maintain healthy air, and a red indicator lights up to inform you that the humidifier has been turned off. The unit will operate for a set number of hours and will turn off automatically when the set time has elapsed. Dedicated sleep mode - the humidifier operates at a minimum noise level and all displays except the speed display are off. Choose between low, normal or strong humidification for maximum flexibility. Fill the container with a cup, or hold the water tank under the tap. The "Max" display shows how full the tank is. When the tank is empty, the humidifier automatically shuts off and the display indicates that it needs to be refilled.