Abstract: A housing body with a card-retention capability includes a wall that has an outer surface and an inner surface. The outer surface is formed with an elongate card-receiving recess that has a recess bottom. The outer surface is further formed with a first cover-restricting flange that extends from a front end of the card-receiving recess and that cooperates with the recess bottom to form a cover-receiving slot, and a second cover-restricting flange that extends from a rear end of the card-receiving recess and that is formed with a tool hole communicated with the rear end of the card-receiving recess. The first and second cover-restricting flanges cooperatively form a card opening that is adapted to permit placing of a card on the recess bottom. The inner surface is formed with a cover-manipulating recess to communicate with the rear end of the card-receiving recess.