How long does it run on a fill?

Airomé does not publish a runtime for this model in the specs given. Expect a few hours per fill from a compact ultrasonic diffuser, and refill when the automatic shut-off triggers.

Does it need batteries?

No. It runs on AC mains power, so it needs a wall outlet and stays tethered by its cord.

What do the two programs do?

The unit offers two programs, typically a continuous mist mode and an intermittent mode. Check the manual for the exact timing of each.

Is it safe to leave on overnight?

It has automatic shut-off, which stops the unit when the water level drops. That makes unattended runs safer, but keep it on a stable, dry surface away from fabrics.

What size space does it suit?

At about 9.3 inches tall it is a compact diffuser, best for a bedroom, office or small living area rather than a large open room.

Is it worth buying over a plastic diffuser?

The ceramic, porcelain, metal and glass body looks more finished than plastic rivals of the same compact size, and automatic shut-off is a feature budget plastic units often skip. You trade a larger tank and cordless placement for the look.