1. Micro-DC PWM Speed Controller 2. Speed Control: Reverse Speed Regulation Through Pwm Mode; Connect To The Negative Pole Of The Power Supply At (Maximum Speed) 3. Motor Forward And Reverse Control: Motor Ccw When The Port Is Not Connected, Motor Cw When The Port Is Connected To Low Level (Less than 0.6V) 4. Red Wire Motor Power Positive Input 5. Black Wire Negative POLE Of Motor Power Supply Carrying Voltage: DC 6V-30V Speed Adjustment Method: Stepless Speed Adjustment Frequency Switching: The Default Position Is 20KHZ, And The 2 Pins Rotated By Speed Regulation Are 2KHZ. Function: Forward And Reverse Switching, Stepless Speed Regulation, (Requires Motor With Built-In Function) Applicable: Applicable To 3650, 3525, 2430, 2418 And Other Brushless Motor Series Colour: Material:PCB Package Contents: 1x Micro-DC Pwm Speed Controller Module Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.