Designed for surface mounting on walls etc., these are small black impact resistant ABS boxes, (75mm × 56mm × 35mm) fitted with an XLR 3 pin female connector (NC3FDL1), XLR 3 pin male connector (NC3MDL1) or Neutrik loudspeaker connector (NL4MP). The rear of the box has two holes for mounting screws, and there is a cable entry fitted with a grommet (maximum cable diameter 6.5mm) in one end.