Cebek R-60 module is a speed controller for DC motors. It will control electric  motors from 9 to 15VDC with a maximum consumption of 0.6A. The speed and  direction of motor is  controlled  via on-board potentiometer or   via remotely wired potentiometer.  The module operates at 100Hz frequency, LED indication of power on and protected  by glass fuse. A suitable external potentiometer can be between 10K & 47k, 10k Recommended, either a standard pot or a centre click pot (giving a positive centre off point)