Cool Mist Humidifier - Mini Humidifier - Portable Humidifier - Travel Humidifier - Personal Humidifier - USB Humidifier (White) WinteTech New Version Cool Mist Humidifier: Ideal for Desks, single rooms, baby rooms, travel hotel room, Planes and kids rooms. Small enough to take with you wherever you go! Plugs into any USB power source including portable phone chargers, puts moisture back into dry air from over-heating or cooling. Hassle-free and simple to use tank-less design: Simply screw onto a standard sized plastic water bottle such as Dasani, Aquafina, Smartwater, Fiji or Evian. And you can decide the bottle size according to your need.(&lt;600ML). USB Cable Connection: Equipped with a USB cable, this humidifier can work with any USB device, like computer, power bank, or even in your car, more convenient to use. Whisper-Quiet Ultrasonic Operation: Less than 15 db means that this humidifier is one of the most silent ever made. automatic shut-off when without water. Improve Air Quality And Prevents Damage From Second Hand Smoke, Stale Air And Allergens: It functions as an ionizer by releasing negative ions into the air which combat harmful positive ions. This provides many health benefits e.g. improves breathing, strengthen the immune system, help to lift your mood and relieve stress.