Auto-Transformers, mounted in steel-cases with a handgrip.
For matching and operating of 230V-units at the 110 … 120V line voltage.
An auto-transformer has only one winding with a tapping, there is no insulation from mains.
For protection against short-circuit and overload a changeable fuse is incorporated.
The input has a 1.8m Power Cord with a mounted US-plug.
The output has a Schuko-socket.