A mobile terminal device configured to have a built in battery and connect to a network, includes a wireless communication interface configured to connect to the network through wireless communication, and a wired communication interface configured to connect to the network directly or indirectly through wired communication. The transaction router, during use, receives the output of the reader and allows standard credit and debit card transactions to pass to the financial transaction processing entity that is called by the reader, to allow the financial transaction to be carried out. Using the system and methods of the present invention, certain objects that appear indistinguishable from other objects to the eye or computer recognition systems, or are otherwise almost identical, generate radically different and statistically significant differences in the image describers that can be easily measured. The driving signal is generated according to the control signal and a periodic pulse signal. The front portion of the preferred corner or detail pad has particular application for sanding into corners of a carcass. In several embodiments, systems specialized for performing one or more aspects of the methods are provided.