The startup capacitor and run capacitor are more robust for greater efficiency operation. Single motor with die cast aluminum housing for smoother operation and better protection of the machine. Stronger handle housing for smoother operation and longer life. Fully adjustable handle height system for ease of use. Large non-marking wheels for hygiene, easy transport and protection. Cord strain relief system minimizes cord breaks, kinks and tears. Mechanical safety interlock prevents accidental start-ups. Built-in circuit breaker protects the motor. Comes equipped with high mounted handle lock/height adjustment, non-marking PVC bumper, dual main switch levers, and thumb activated safety interlock.