Dental LED Brushless Micro Motor+1:5 LED Increasing Contra Angle Handpiece. Type of motor: brushless motor. Internal Spray. Three optional settings(1:1/1:5/16:1). Rotation: 2,000-40,000rpm. 2000rpm-40000rpm(1:1). 100rpm-2500rpm(16:1). 10000rpm-200000rpm(1:5)