The BTS7960 is a high-current full-bridge motor driver module. The Key features are:

• Input voltage: 6V to 27V
• Maximum allowable current: 43 A
• PWM capability: up to 25 kHz
• Two PWM output pins for speed control in direct and reverse directions
• Two EN output pins to control motors
• Two IS input pins to protect against high current and heat

These modules control DC motors using PWM (Pulse Width Modulation) technique. These modules convert a constant input voltage to a variable voltage for motor. The speed can be controlled by changing the DC motor voltage. PWMs usually have a fixed frequency and can be controlled by controlling the time that the pulse is HIGH (Duty Cycle).