A computer peripheral device includes a first housing, a second housing, a connecting member and a judging circuit. The connecting member is made of a conducting material and includes a rotating shaft. The second housing is rotatable relative to the first housing with rotation of the rotating shaft, so that the computer peripheral device is switched between a first configuration and a second configuration. The judging circuit includes a first conducting contact and a second conducting contact. The judging circuit activates a first function when the computer peripheral device is adjusted to the first configuration such that the first conducting contact is electrically connected to the second conducting contact through the connecting member. The judging circuit activates a second function when the computer peripheral device is adjusted to the second configuration such that the electrical connection between the first conducting contact and the second conducting contact is interrupted.