This is a 300ml vintage steampunk train-shaped ultrasonic aroma diffuser and cool mist humidifier.
It typically features a bronze-colored, textured finish designed to look like a decorative tank or locomotive.
The device is designed for aromatherapy and includes functionality for lighting and different mist modes.
It is often marketed under various brand names such as HIROGA, Uutvmp, or generically as a "vintage train" model.