About this item 270 ML Capacity & Easy to Carry The liquid water is atomized into micron-sized water particles by ultrasonic vibration. The volume of 270ml and the fine spray are used to increase the air humidity. It is a good companion for air-conditioned rooms. And Easy to carry to office or home. Two Spray Modes Our cool mist humidifier contains two spray modes: continuous spray & intermittent spray. First single press mist button to start the continuous mist mode; Second press mist button to switch to intermittent mode. With LED colorful night light: Three LED light modes, long press for 3 seconds to switch arbitrarily marquee atmosphere light, the colorful rotation, fixed the color Powered By Usb /Waterless Auto-OffThe cool-mist humidifiers powered by USB Adapter. The humidifiers will automatically shut off when water runs out, no need to worry about causing danger to your family or damaging the device itself, safer than a regular humidifier.