A port (314, 414, 514, 614) for use with an article of footwear adapted to engage a foot, the article of footwear having a sole structure and an upper portion connected to the sole structure, the port comprising: a housing (324, 424, 524, 624) adapted to be at least partially received within the sole structure of the article of footwear, the housing comprising a bottom wall (343, 443, 543, 643) and a plurality of side walls (339, 439, 539, 639) extending upward from the bottom wall, the bottom wall and the side walls defining a chamber (348, 448, 548, 648) adapted to receive an electronic module (322, 422, 522, 622) therein, the bottom wall further comprising a biasing member (351, 451, 551, 651) adapted to engage the module and exert an upward biasing force on the module when the module is received in the chamber, wherein the housing further comprises a retaining member (349, 449, 549, 649) adapted to exert a downward force on the module opposite the biasing force of the biasing member to retain the module within the chamber; and an interface (320, 420, 520, 620) engaged with the housing and having at least one electrical contact (356, 456, 556, 656) exposed to the chamber, the interface being adapted to form an electrical connection with the module such that the module engages the at least one electrical contact when the module is received within the chamber; characterized in that the retaining member is a flexible retaining tab (349, 449, 549, 649) extending from at least one of the side walls; wherein the retaining tab (349, 449, 549, 649) is moveable by flexing between a first position, where the retaining tab is adapted to retain the module (322, 422, 522, 622) within the chamber, and a second position, wherein the module can be removed from the chamber; and wherein the retaining tab (349, 449, 549, 649) has a ramped surface adapted to be engaged by the module (322, 422, 522, 622) to flex the retaining tab toward the second position to permit insertion of the module into the chamber. a housing (324, 424, 524, 624) adapted to be at least partially received within the sole structure of the article of footwear, the housing comprising a bottom wall (343, 443, 543, 643) and a plurality of side walls (339, 439, 539, 639) extending upward from the bottom wall, the bottom wall and the side walls defining a chamber (348, 448, 548, 648) adapted to receive an electronic module (322, 422, 522, 622) therein, the bottom wall further comprising a biasing member (351, 451, 551, 651) adapted to engage the module and exert an upward biasing force on the module when the module is received in the chamber, wherein the housing further comprises a retaining member (349, 449, 549, 649) adapted to exert a downward force on the module opposite the biasing force of the biasing member to retain the module within the chamber; and an interface (320, 420, 520, 620) engaged with the housing and having at least one electrical contact (356, 456, 556, 656) exposed to the chamber, the interface being adapted to form an electrical connection with the module such that the module engages the at least one electrical contact when the module is received within the chamber; characterized in that the retaining member is a flexible retaining tab (349, 449, 549, 649) extending from at least one of the side walls; wherein the retaining tab (349, 449, 549, 649) is moveable by flexing between a first position, where the retaining tab is adapted to retain the module (322, 422, 522, 622) within the chamber, and a second position, wherein the module can be removed from the chamber; and wherein the retaining tab (349, 449, 549, 649) has a ramped surface adapted to be engaged by the module (322, 422, 522, 622) to flex the retaining tab toward the second position to permit insertion of the module into the chamber.