Touch operation and continuous operation(with speed controller)are possible.Adopting neoprene sponge rubber for a head rubber, it can fit only by pressing lightly.It is stable with low center of gravity and quiet driving sound.Rotation Speed (rpm):350 to 2500W x D x H (mm):100 x 170 x 135Power (V):AC100Top Diameter: 60mmMotor: Dampening Motor