How long does it run on a full tank?

About 6 hours on continuous mist and up to 12 hours on intermittent mode, per the listed specs. That is with the 500 ml tank filled.

Does it have a battery?

No. It runs only from a USB cable at DC5V/1A, so keep it plugged into an adapter, laptop or power bank.

How much area does it cover?

It is a personal humidifier, not a room unit. Expect it to help a desk or a small bedside area, not a whole bedroom.

Is this an open-box item?

The listing describes it as open box with original accessories. Confirm the seller's return policy before ordering.

Is it worth buying over a larger humidifier?

Only if you want a small, quiet unit for one spot. A full-size humidifier covers a room better but takes more space and power.

Where is the Portable Mini Humidifier cheapest?

At eBay, for $11.00, as of our latest check.

Where can I buy the Portable Mini Humidifier?

2 stores we checked sell it, including eBay, Amazon.

Portable Mini Humidifier

Best price now

$11.00at eBayObserved at 8:34 PM

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Our take on the Portable Mini Humidifier

The GXZ-J623 is a 500 ml USB-powered cool-mist humidifier for a desk or nightstand. It runs up to 6 hours on continuous mist and about 12 hours on intermittent, and it has a night light. It has no built-in battery, so it must stay plugged into a USB adapter or port. No price was given for this listing, so compare it against other 500 ml USB humidifiers before buying.