Easy to Use & Container Diversuty: Fill in your decorative bottle or jar, a coffee mug or drinking glass at work, or even a disposable water bottle when on the go, insert it, hit the switch and you good to go for many hours. Easy to assemble, easy to change the filter, easy to use. Mini Figure & Universal Power Solution: This mini humidifier is very lightweight with compact size(6.7x0.8x0.8 inches, 2 oz), the tube and cotton filter is removable, which allows you to take it anywhere you go pretty easy and convenient. Besides,It comes with a USB cable that you can plug into any power source like a power bank, laptop, or cell phone adapter. You can bring it all over the world. Automatic Power Off: This mini humidifier will automatically shut off when water runs out. No worry about damaging the device itself or causing danger to users, giving you and your family a great sense of security. An 8-hour automatic power-off mode to prevent excessive humidity in the room, let you enjoy a continuously moisturize environment leisurely. If you need to turn it back on, just press the power button to continue operation. Peace & Quiet: 30dB non-inductive operation can create a quieter sleeping environment and humidify your living space to prevent dry, stuffy air and flu/cold infecting you and your loved ones. Keep your skin hydrated even in winter. Also, there is no light when you press it to start which will not disturb your sleep. Tips of use: This mini humidifier do not have a rechargeable battery. Please use the USB cable to power the humidifier. And do not use essential oil, or it will make the portable humidifier doesn't work.