Feature: 1. Made of high quality metal and electronic components, it is solid, durable and good performance, long service life.  2. This motor speed controller is designed for accomplishing reversing het motor's direction.  3. Digital display shows the rate in percent of actual speed to maximum speed.  4. Wide input voltage from DC 10V to 55V.  5. Great case with holes can protect the controller board from damage as well as dissipate heat.  6. High power allows setting rotation direction.  7. Motor speed controller only, other accessories demo in the picture is not included     Specification: Material:Metal, Electronic Components;  Input Voltage:DC10-55V;  Output Voltage:Linear with load;  Input Current:Over motor's working current;  Output Current:Determined by load;  Continuous Current:60A;  Max Current:100A;  Regulation Style:Regulating Current;  Regulation Method:Potentiometer (with switch);  Regulation Range:0-100%;  Working Frequency:15KHz;  Forward and Reverse:Support;  Digital display positioning:0-100 (percentage of full speed);  Potentiometer Installation Hole:0.7cm/0.28in;  Size:app.12.8 x 9.8 x 4cm/5.04 x 3.86 x 1.57in;  Net weight:360g;  Quantity:1 Pc.    How to wire: 1. Connect the negative pole of the DC power supply to the "Power-" port and the positive pole to the "Power+" port; connect the negative pole of the DC motor to the "Motor-" port and the positive pole to the "Motor+" port.  2. Adjust the switch clockwise when the power is turned on. You will hear a crisp sound from the inside of the controller, which proves that the internal speed switch has been turned on.  3. As the switch angle increases, the speed of controlling the motor is also increasing. When the switch is turned to the bottom, the speed of the motor also reaches the highest value.    Note: -The digital display only displays 0-100 as a percentage meter of the motor's full speed, not the actual speed of the motor.  -Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you bid.  -Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you     Package included: 1 x DC Motor Speed  Controller