Specifications: DC motor speed controller allows you to control the speed of a DC motor with a pulse width modulated (PWM). The item with connective label and very easy to install and use. The wiring is led out by the wire, which is simple and convenient to use. 1. Connect the red wire to the positive pole of the power supply. 2. The black wire is connected to the negative pole of the power supply. 3. The blue wire is connected to the positive pole of the motor. 4. The green wire is connected to the negative pole of the motor. Item Name: DC Motor Speed Controller Material: ABS Input Voltage Range: DC 9V-60V Applicable Current: Rated Current 10A, Maximum Current 20A Features: Durable, Useful, Easy to Install Size: 5cm x 3.3cm x 10.5cm/1.97" x 1.3" x 4.13", Cable: 20cm/7.87" (Approx.) Notes: Due to the light and screen setting difference, the items color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Included: 1 x DC Motor Speed Controller