This driver uses chips BTS7960 composed of high- drive full H-bridge driver module with thermal over-current protection. Double BTS7960 H-bridge driver circuit, with a strong drive and braking, effectively isolating the microcontroller and motor driver High-current 43ADouble BTS7960 current (43 A) H bridge driver;5V isolate with MCU, and effectively protect MCU;5V indicator on board;voltage indication of motor driver output end;can solder heat sink;PIN Definition:1. RPWM: Right Turn PWM2. LPWM: Left Turn PWM3. 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. GNDConnections: 1:VCC: 5V from Microcontroller(MCU)GND: GND from Microcontroller(MCU)L_PWM: PWM or 5V from Microcontroller(MCU) for CCW(CW) TurnsR_PWM: PWM or 5V from Microcontroller(MCU) for CW(CCW) TurnsR_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) TurnsR_PWM: 5V from Microcontroller(MCU) for CW(CCW) TurnsR_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 supply (can share with MCU 5 V);Able to reverse the motor forward, two PWM input frequency up to 25kHZ;two heat flow passing through an error signal output;isolated chip 5V 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+blackMaterial:PCBSize:4 x 5 x 1.2cmPackage Contents:2 x BTS7960B H-bridge 43A High- Motor Driver ModuleOnly 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.