an insulative housing having a main body, and first and second sidewalls substantially parallelly extending vertically from opposite ends of the main body;

a hook engaged with the first sidewall of the housing and, together with the main body, the first and second sidewalls defining a receiving cavity for receiving an electrical card;

a plurality of terminals disposed in the housing and having connecting portions extending into the receiving cavity for contacting the electrical card;

a pair of switching terminals engaged with the housing and each switching terminal defining a contacting portion, the contacting portions engaged with each other during insertion of the electrical card into the receiving cavity and disengaged from each other during withdrawal of the electrical card from the receiving cavity; and

wherein a cover is mounted onto a top of the second sidewall and defines a base and a hook portion integral with the base, the base and the hook portion being substantially over the contacting portions of the switching terminals to prevent a user's fingers from touching the contacting portions of the switching terminals.