An apparatus for a self-cleaning litter box having a control system for a mechanical self-cleaning mechanism. The compounds and compositions of the invention can induce the biosynthesis of various cytokines and are useful in the treatment of a variety of conditions including viral diseases and neoplastic diseases. While awaiting transfer to the network address, the data must be stored or distributed to a buffer. An identifying device identifies a length of the sheet in a sheet supply direction based on detection results of the sheet detection device and the tray detection device. The second clamping device is also coupled to the reference voltage. A positioning portion on each positioning element presses a respective interface card so as to achieve the effect of positioning the interface card.