This Honeywell Top Fill Tower Humidifier blends a series of convenient and efficient features that will allow you to create a comfortable breathing environment. It is easy to use with multiple ways to refill it. The inclusion of an adjustable LED humidistat provides an accurate measurement of the surrounding levels of humidity. The Honeywell humidifier is designed with a filter check light so you can stay updated. It has a refill. It includes a humidity reached light, which offers the visual cues needed for optimal efficiency.