EASY TO USE: You just fill up the cup with water, after the internal filter is soaked, plug the device into your USB port and press the on/off button.It can be powered by power bank/PC/Laptop/USB Charger and other devices with 5V 1A, it can also be placed anywhere, very convenient to carry and easy to operate400ML VOLUME WATER TANK: Enough big volume can satisfy your demand to continuously work for 10 hours. Every 4-6 hours, the humidifier diffuser will automatically shut off to ensure safety whether there is water inside or not.COOL MIST HUMIDIFIER: Ideal for Desks, single rooms, baby rooms, travel hotel room. Small enough to take with you wherever you go, even your car. Plugs into any USB power source including portable phone chargers, puts moisture back into dry air from over-