*  .With 4 speed: 30rpm, 40rpm, 50rpm, 60rpm can be adjustedfreely * 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 speedup.                                                           *  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                     *  Annunciator function: when the motor auto-stop about 6 seconds, t  he buzzer begin to give an alarm and bibi sound, press ON/OFF button for restarting  if not released the annunciator in one minute, it will auto-stop.