Patent ID: 8376557

Claim:
A housing comprising: a wall comprising a bottom surface, a through hole defined in the bottom surface, and a discontinuous ring-shaped engagement member surrounding the through hole, the engagement member having a first gap and a second gap aligned with the first gap; a connector connected to the engagement member and rotatably engaged in the first gap; a coupler comprising a main body and an engagement portion, the main body comprising a first surface, a second surface opposite to the first surface, and a circumference surface interconnecting the first surface and the second surface, the engagement portion extending from the circumference surface, a first engagement hole defined in a central portion of the main body through the first surface and the second surface, an opening defined in the second surface surrounding the fist engagement hole, the main body rotatably connected to the connector and receivable in the through hole, the engagement portion engagable in the second gap; and a foot pad connected to the coupler to seal the opening, the foot pad and the coupler being jointly rotatable relative to the connector to selectively expose the foot pad or the first engagement hole of the coupler toward the through hole, and the foot pad, the coupler and the connector being jointly rotatable to a position in which the combined foot pad and coupler is at least partially received in the through hole.