How big a room will it humidify?

Dreo rates it for about 300 sq ft, so a bedroom, nursery or office. Larger open rooms will need more than one unit or a bigger model.

Does it shut off when the water runs out?

Yes. It has automatic shutoff when the tank is empty, so it is safe to leave running overnight.

Yes, but hard tap water can cause white mineral dust on surfaces. Distilled water avoids that.

Yes. You set a target humidity and auto mode cycles the mist to hold it, and there is also a timer.

The 3.7 L tank lasts roughly a night on low to medium output. High speed drains it much faster.

It is rated at 28 dB, which is close to a whisper. Most owners say it does not disturb sleep.

At Mercari, for $25.00, 37% under what the other stores charge, as of our latest check.

Rated 3.9 out of 5 from 518 ratings.

4 stores we checked sell it, including Mercari, eBay, nextrony, Walmart.

$25.00at MercariChecked 13 h ago

37% under what the other stores charge

Compared across 4 stores. Prices are checked against each store and labelled with when.