[Every time you use the 420 mini humidifier, please remove the cotton swab (be careful not to lose the bottom spring) and soak it in water for 1-2 minutes, allowing the cotton swab to fully absorb water before installation and use.][You will get a 420ml green humidifier with 2 Pcs Replace Filter Sticks, perfect for use in babies, kids, office, living room, desk, car or travel easily. you can enjoy your humidifier anywhere and improve your life quality. Please don't damage the atomizing plate of spray nozzle. recommended to add 80% water.][The 420ml mini mist humidifier Powered by USB charger, it can work just only in the case of power supply, such as USB adapter (500mA - 1A), The USB interface of computer, laptop, power bank.][Portable mini humidifier, Auto Shut Off Function: Mini Humidifier automatically shut-off when the water level is low or 3.5 hours automatic power-off protection. No heat involved, no risk of burns, Quiet operation.][420ml mini humidifiers produce a near-silent frequency 30dB ensuring ultra-quiet operation. This humidifier wont bother you while sleeping and working. This small air humidifier can soften and moisten dry and chapped skin in winter. Use as mister during summer or hot weather.]