Adjustable Length Stick+Container Diversity--Portable humidifier length is adjustable, so it can combine with different containers.Such as mug,normal glass bottle or mineral water bottle, which there is no water tank, so it break inherent container limitations. Note: no water bottle is included. Portability+Wide Application-- Small size(detachable design) makes it easy to take with you anywhere.It will work anywhere you can plug in a USB for added on-the-go convenience! This USB humidifier can be competent in various scenarios, whether on business trip, travel, driving, at working or sleeping.^ Quietness+Easy Operation--The personal mist humidifier adopts newest ultrasonic technology, which can achieve lower power(0.15 Watt) and be quieter. Operating noise of this mini humidifier is less than 30dB, it won't disturb your rest even at night. It is easy to use this desk office humidifier with only one button.^ USB Port+Auto Shut off--The small car humidifier with USB interface, so it can work anywhere you can plug in an USB. And the handheld vehicular humidifier can be shut-off after 8 hours automatically, no worry while sleeping.^ Gift Choice --Portable for home, office, gym, yoga or baby room. Perfect gift for family and friends who hate the dry air. ^