An electronic module (10) includes a housing having a longitudinal body portion and a mounting portion extending rearward from the body portion, with a channel (1221) defined in a top or bottom section of the mounting portion; an ejector mechanism including a slider member (61) accommodated in the channel of mounting portion and an actuator member (62) pivotally engaged with the mounting portion, said actuator member further linked to the slider member for pushing the slider member forwardly moving along the channel; and a spring member (8) arranged between the slider member and the mounting portion and capable of pushing the slider member rearward moving along the channel.