TaoTronics TT-AH001 Cool Mist Humidifier, LED Display, 4L Ultrasonic Humidifiers for Home Bedroom, with Filter, Adjustable Mist Levels, Waterless Auto Shut-Off, Grey -(4L/1.06 Gallon, US 110V) Note: Please do not use with essential oils, which will damage the machine and cause leakage problem. Quiet operation for bedroom use: Ultrasonic humidifiers are incredibly silent, produces less than 38 db of noise; perfect for your baby and a disturbance-free sleep at night. 4L tank capacity, works for all night: over a gallon of water lasts for 12-30 hour working time on a Full tank; designed to humidify the air in rooms up to 10-30 M/ 107-322 ft, bedroom, nursery, office and so on. Informative LED display: built-in humidistat tells you the current RH; easily choose between three mist levels; set your desired humidity level, 40-60% is best. Upgraded version: dustproof sponge prevents dust from getting in the base; two built-in handles for easy-carrying and easy-filling. Safe to use: automatically shuts off when water runs out; microporous cartridge filters the water from micro-organisms and bad odor, we recommend you change filters every 4-6 months.