... in the memory, 10 kinds of accelerating and decelerating speed Features:Brushless motor, no carbon dust pollution, unnecessary ... Microprocessor control, digital display which indicator the speed, time, RCF in operation, speed raising and reducing quick, operate simply. ... power off. Technical parameters:Max RCF 4420*gMax speed 5000r/minMax capacity 6*100mlSpeed accuracy ±50r/minNoise <=58DbaTime range 1 ...