Specific Top-refilling Design: No need to take the device apart to fill water, just remove the top cover and directly add cool water into the humidifier. What's more, the opening on the unit is wide enough, you can stick your whole hand and clean it. Large Capacity and Waterless Shut-off: Hold 4 liters (1 gallon) of water, give off more humidity and lasts longer than a smaller tank would give off. It'll automatically shut off when there's not enough water to make sure the humidifier not be damaged. Whisper Quiet and Adjustable Timer Settings: The humidifier is silent (less than 32dB) while working, it doesn't distract your studying, working or taking a nap. You can set the humidifier to shut off automatically after 1, 2, 4 or 8 hours, or set to ON where it runs until it runs out of water. 360° Directional Spout and Easy Control: The directional spout allows for you to get the moisture where you want it to be. Sensitive touch control panel is easy to operate and the included remote also controls any settings for convenience. 100% Customer Satisfaction: 90 days money-back and 24 months worry-free guarantee. We, at OTHWAY will always stand behind our humidifiers, please contact us if any questions and we'll solve them less than one day.