Gentle ROCKING and ROLLING system for optimum mixing,Suitable for mixing blood sample and viscous substance,Brushless DC motor for quiet operation and maintenance free long life,Removable rollers for proper cleaning,Adjustable roller rod spacing to hold different diameter tubes,Adjustable Speed ranging from 10 to 100 RPM,Adjustable timer ranging from 1 min to 99 mins and infinite Pulse mode,Error indication for overloading of samples.