A charging and discharging strategy for a rechargeable battery pack is disclosed. The laser light is generated from an oscillator, passes through an attenuator that includes a filter, and passes through an optical system after passing through the attenuator. An inlet port receives pieces of seafood for the purpose of the grading thereof and arranged relative to the rollers to dispose the seafood between the rollers. The part manufacturer device in turn includes configuration information on each of lower parts which include each of the component parts on a manufacturing lot or product number basis for each type of component parts, and a function of providing information and services on each of the parts. This invention uses a variable inputoutput architecture to enable multiple matrix sizes to be implemented in a single product.