A bearing directed to a bushing positioned within a housing that is positively retained to prevent the bushing from moving axially with respect to the housing and that also prevents the bushing from rotating relative to the housing. The driving circuit is employed for driving a light source externally connected to the optical navigation sensor. A second switching transistor and a second output transistor are serially connected between the grounded terminal and the second output terminal. The second subscriber identity card camps on the same cell or a different cell via the second wireless module.