How long does one fill last?

Up to 7 hours on the steady low setting. High mist drains the tank faster, so expect roughly half that.

Does it shut off when the water runs out?

The listing does not state an auto-off. Do not run it dry; unplug it when the tank is empty.

Yes. The seven LED colors run independently of the mist, so you can use the light with the diffuser off.

It is a small-room diffuser. It works best in a bedroom, office or nursery rather than an open living area.

Use distilled or filtered water to reduce mineral buildup in the ultrasonic plate and keep the mist clean.

Yes. Ultrasonic diffusers of this type produce a faint water sound rather than a fan noise, which most owners find easy to sleep near.

6 stores we checked sell it, including Bealls Florida, Walmart, Ulta Beauty, Shop Simon, Best Buy.

At Walmart, for $38.45, 23% under what the other stores charge, as of our latest check.

$38.45at WalmartChecked Nov 9

23% under what the other stores charge

Compared across 6 stores. Prices are checked against each store and labelled with when. Store links may earn us a commission. Price via Klarna.

It checks today's price at every store, compares the alternatives and answers in about a minute.