Acoustic Audio Tek?Portable Bottle Cap Air Humidifier with bottle for office home travel--Yellow INTRODUCING THE BEST GO-ANYWHERE ULTRASONIC PORTABLE COOL MIST HUMIDIFIER THAT FITS IN YOUR PURSE OR COAT POCKET Relief from dry air, cold, flu, cracked skin in the winter and cold weather. Use as mister during summer or hot weather. Or even as a moisturizer for your hands by holding hands over mist. Convenient to use anytime, anywhere, this personal-use humidifier is small enough to fit into a purse, laptop bag, or suitcase & affects an area of 5 sq.ft. ? Included with the humidifier are 2 filters (one installed) & a USB cable. To assemble, insert the filter into the underside of the humidifier, then plug the humidifier into the USB cable & the USB cable into a USB port. Every 2 weeks, clean the nozzle of the humidifier with a cotton swab dipped in vinegar to remove dirt & minerals. Note: Bottles are included.