Capacity: 4U — supports up to 4 standard 19″ rack units of equipment.

Approximate external dimensions: Width ~ 600 mm, Depth ~ 450 mm, Height ~ 280 mm. For example one model lists 600 × 450 × 280 mm for a 4U wall cabinet. 

Mount type: Wall-mount  rather than floor-standing.

Construction: Typically cold-rolled or coated steel; usually comes with front door (glass or metal), removable side panels for access, cable entry points top/bottom.

Use-case: Small network installations, CCTV/telecom patch panels, and environments where a compact rack is needed on a wall.