A roller for a sheet product dispenser includes a roller shaft, a roller frame molded onto the roller shaft, and a plurality of flexible rubber portions overmolded onto the roller frame and spaced along a length of the roller frame. An annealed tool steel liner is inserted into the backing steel cylinder, followed by heat treating to harden the tool steel liner. and bacteria such as, for example, enteropathogenic Escherichia coli O-157 or Methicillin tolerance Staphylococcus aureus. The method includes steps of: performing an OR operation of the plurality of source signals to obtain an operational output signal; and latching the operational output signal in an active low manner in response to a selection command to obtain the selection signal. Updated recognizers may be downloaded from a recognizer server.