A method and an apparatus for synchronizing card without traffic in multi-card multi-standby mobile terminal are disclosed. Providing the box and dome camera mounting parts on the housing of the camera enables mounting of the camera in box and dome camera configurations, and allows the user to delay the decision of choosing which configuration, thereby reducing the complexity of engineering design and installation. The first antenna unit is disposed on the first surface, and comprises at least a first slot with a wider inside and narrower outside at the edge of the first antenna unit.