Quick change blow mold tooling includes a pair of mold cavity blocks that cooperate to define a series of blow cavities. The more complex the driver circuit is, the more complexity the start pulse and the clock pulse tend to have, which will increase the manufacturing cost of inspection signals. In an embodiment, liability estimates may be associated with past or theoretical accidents. Upon chewing, the shell is broken or dissolves thereby releasing its contents, which include the brush and possibly a dentifrice. When the voltage is greater than the first predetermined value, the comparing circuit outputs a controlling signal to reduce a work frequency of a load.