How long does the 220ml tank last?

Expect a few hours of mist per fill at a low setting. Output is small, so a full tank covers a work session or a night, not a full day.

Can I run it from a power bank?

Yes. It draws power over USB, so a laptop, wall adapter or power bank all work. Check that your source supplies enough current for the mist to run steadily.

Does it need distilled water?

Use distilled or filtered water to cut down on mineral scale and white dust. Tap water works but leaves deposits that need cleaning.

Does it have an auto shut-off?

No automatic shut-off is stated. Turn it off when the tank runs dry so the unit does not run empty.

Is it good for a whole bedroom?

No. It is a personal humidifier for a desk or nightstand. For a full room, a larger ultrasonic or evaporative unit with a bigger tank does the job.

What comes in the box?

The humidifier itself, plus a USB cable for power. A wall adapter is not included.

Where is the Portable Mini USB Cool Mist Humidifier cheapest?

At Deal.ai, for $22.99, as of our latest check.

Free shipping on everything10% off your first orderNo account needed · Buy 2, save 10% · 3+, save 15%

Portable Mini USB Cool Mist Humidifier

Sold and shipped by Deal.ai

$22.99Free shipping

Buy 2, save 10% · 3+, save 15%

Extra 10% off your first order

Color: Random

Arrives about Nov 17–26, from a US warehouse

30-day full refund: if you're not happy with it for any reason, or it never arrives, tell us within 30 days and we refund you in full. Shipping and refunds