What materials can the 12W laser engrave and cut?

VEVOR lists wood, acrylic, leather and cloth. A 12W diode handles thin wood and dark acrylic well; clear acrylic and thick stock are harder and usually need multiple passes.

How big is the working area?

The bed is 100 x 100 mm, about 3.94 x 3.94 inches. Each job must fit inside that square, so large panels need tiling or a bigger machine.

Does it focus automatically?

No. Focus is manual, so you set the lens height for each material thickness before running a job.

Is it safe to use indoors?

It is an open-frame laser with no enclosure or built-in extraction. Use laser safety glasses, ventilate the room and keep it away from pets and children.

What comes in the box?

The laser engraver, a complete accessory set and a user manual.

Is it worth it over a larger open-frame engraver?

Only if small, flat jobs and a small footprint are your priority. Larger rivals cost more but cover far bigger work areas and often add autofocus or air assist.