A DC to DC converter has first and second transistor coupled at a first node and coupled between first and second power supply terminals. It is determined whether or not a user account with authentication information that is the same as the transmitted authentication information exists in the destination cooperative information processing apparatus. 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. Preferably, two inserts having a collar and a stem have a combined length that reinforces the predetermined spacing within a predetermined tolerance when compression is adjusted.