Keyed housing for use with small size plug connectors

A shielded housing for housing an inner connector mounted to a circuit board, the inner connector including a horizontal card-receiving slot for receiving an edge card of an opposing mating, connector, the housing comprising:

• an conductive body having a top wall an, endwall and two side walls that cooperatively define a hollow interior enclosure for fitting over and enclosing said inner connector upon the circuit board, the body further including an opening along a front face of the housing and aligned with said inner connector,
• the housing including a pair of guide members disposed on opposite sides of said opening and extending lengthwise within said body, the pair of guide members engaging and guiding the opposing mating connector into said hollow interior enclosure and into engagement with said inner connector card-receiving slot.