A liquid crystal display with two insulating substrates. A self-contained housing is configured for gripping by a person’s hand for cordless manipulation in a dermatologic treatment procedure. Further, a child-carrying feature attaches at a front end to a frame support member and at a back end to a rotatable handlebar assembly. Another problem is that an increase in memory capacity leads to an increase in the area, despite an attempt at integration through advancement of transistor miniaturization. Therefore, the displacement of the hydraulic pump can be forcedly changed to the neutral position.