A front bezel includes a main body (10) defining a light-pervious area (142) therein, a light-directing member (20) secured to the main body, a shielding plate (30) pivotably secured on the light-directing member, and a gear member (40) rotatably secured on the light-directing member. The light-directing member has a light-directing portion (22) defining a space for securing a light source (60) therein. The space communicates and aligns with the light-pervious area. The light-directing portion defines an installing opening (226) communicating with the space. A plurality of teeth is formed on the shielding plate. The gear member has a plurality teeth (41) meshing with the teeth of the shielding plate, and is rotatable to pivot the shielding plate to cover one portion of the space in which light source is secured, and thereby prevent the light emitting out of the space.