A magnet is provided to one of two members, which make relative rotation therebetween. For instance, the state transition rules are specified as a Term Rewriting System in which each rule specifies a number of allowable state transitions, and includes a logical precondition on the stored values and a functional specification of the stored values after a state transition in terms of the stored values prior to the state transition. To improve such scanner, the recording optics comprises a first imaging optics and a second imaging optics. The operational range of the RFID switch device may be extended when a region of the booster antenna overlaps a region of the conductive trace pattern on the RF module via inductive or capacitive coupling.