✔ HIGH QUALITY CHIP -High Precision optical engine, More accurate Positioning.
✔ MICRO SWITCH - 5 million micro switch, durable.
✔ SUPER ROLLER - roller is made of high rubber ring, Strong sense of friction and manipulation. roller is made of high rubber ring, Strong sense of friction and manipulation
✔ ADD IRON - add counter weight design, Enhance the stability, smooth move more smooth.