Thanks to effective high-frequency technology, the water is converted into a micro-fine mist and given off to the indoor air by a fan. The 2-in-1 A250 AQUA PRO water filter ensures pure humidification without leaving any residue. The included Ionic Silver Stick® utilizes the antibacterial effects of silver and ensures optimal water quality. These low-noise appliances have a very high level of humidification, which can be individually regulated by an output control. As the room temperature can fall slightly as the mist evaporates, most BONECO Ultrasonic Humidifiers can be set to give off cool or warm humidification at the press of a button.