Althrough the Power series was only in production for five years, two distinctive body shapes were created. The first shape, used for the 540P, was more quite similar to its Radius and Saber siblings, but with squared off shoulders. In 1988, a new 'reverse style' shape was introduced for the 540PⅡ-HH and 540PⅡ-SH models. More reverse models were issued as the 540PHH and 540PSH in 1989.
The series was discontinued after 1991.