This is an ultrasonic humidifier from Francfranc. I'm selling it because I've replaced it with a larger water tank model. It's easy to use with a dial to easily adjust the mist output. It can be used for up to 8 hours, providing sufficient humidification while you sleep. You can use aroma water, antibacterial deodorizing water, and aroma oils, so you can enjoy both moisture and your favorite fragrance! I switched to a different model immediately, so it has only been used a few times, but please refrain from purchasing if you have any concerns. Thank you for looking.