A communication module includes a housing member, an electronic module, and a slidable mechanism. The housing member includes at least one fastening and releasing region, which is disposed on an external surface thereof. The fastening and releasing region has a first slant. The electronic module is partially disposed within the housing member. The slidable mechanism includes at least one extension arm with a second slant. The extension arm is accommodated within the corresponding fastening and releasing region. The second slant is aligned with the first slant, and a slope of the second slant is larger than a slope of the first slant.