A robot apparatus is capable of audibly expressing an emotion in a manner similar to that performed by a living animal. The dispersion frame technique is extended in the present invention to provide dispersion frame rules with user-defined parameters thereby creating a dynamically modifiable rule set. The workpiece in some examples can be configured such that the battery is neither removable nor replaceable. The sear spring and set screw are contained in a block in the housing. The processor does not receive the image data as the image data is being transferred from the imager to the memory.