This driver uses chips BTS7960 composed of high-power drive full H-bridge driver module with thermal over-current protection. Double BTS7960 H-bridge driver circuit, with a strong drive and , effectively isolating the microcontroller and motor driver! High-current 43A Double BTS7960 current (43 A) H bridge driver; 5V isolate with MCU, and effectively protect MCU; 5V power indicator on board; voltage indication of motor driver output end;can solder heat sink; PIN Definition: 1. RPWM: Right Turn PWM 2. LPWM: Left Turn PWM 3. R_EN: Right Turn Enable (High Active) 4. L_EN: Left Turn Enable (High Active) 5. R_IS: Right Turn Current Warning (May Leave Floating) 6. L_IS: Left Turn Current Warning (May Leave Floating) 7. VCC: (5V) 8. GND Connections: 1: VCC: 5V from Microcontroller(MCU) GND: GND from Microcontroller(MCU) L_PWM: PWM or 5V from Microcontroller(MCU) for CCW(CW) Turns R_PWM: PWM or 5V from Microcontroller(MCU) for CW(CCW) Turns R_EN and L_EN: 5V from Microcontroller(MCU) 2: VCC: 5V from Microcontroller(MCU) GND: GND from Microcontroller(MCU) L_PWM: 5V from Microcontroller(MCU) for CCW(CW) Turns R_PWM: 5V from Microcontroller(MCU) for CW(CCW) Turns R_EN and L_EN: PWM from Microcontroller(MCU) Just need four lines from MCU to driver module (GND. 5V. PWM1. PWM2); isolation chip 5 V power supply (can share with MCU 5 V); to reverse the motor forward, two PWM input frequency up to 25kHZ; two heat flow passing through an error signal output; isolated chip 5V power supply (can be shared with the MCU 5V), can also use the on-board 5V supply; the supply voltage 5.5V to 27V; Colour:blue+black Material:PCB Size:4 x 5 x 1.2cm Package Contents: 2 x BTS7960B H-bridge 43A High-Power Motor Driver 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.