*With 4 speed: 30rpm, 40rpm, 50rpm, 60rpm can be adjusted freely *Time: 5 different choice for time setting, 3min, 6min, 9min, 12min, 15min *Rotate&Counter-Rotate: when rotate in a contrary way, it can be adjusted, in a mean while, it will pause 2 seconds and exist a process: speed down and speed up. *Display for accumulative rotate time: it can display the number for rotate time. *Display for counter down: display the number for fixed time. *Auto-rotate function: When in a normal status, press this button then let it start to auto-rotate