1. Double H bridge, which can drive two DC motors, single 7A current, high power; Wide voltage input 6.5V ~ 27V; Signal optocoupler isolation input, IO port can be directly controlled, without interference; Undervoltage protection, to prevent instantaneous high-current burned module; High-power and electrostatic discharge circuit, inhibit the ient interference pulse and static, enhanced EMC performance, stable and reliable product, industrial design. 2. Power supply voltage 6.5V-27V, power supply must not be connected to or over 27V, otherwise it may burn out the module, it is recommended that the power input in series 1 fuse.. Dual motor interface, each rated output current 7A, current 50A, the motor interface must not short-circuit, the proposed series 10A fuse. Control signal voltage 3-6.5V, respectively, is the enable signal and the positive inversion control signal. 3. Enable signal terminal () input PWM adjustable speed, PWM frequency range 0-10KHZ, PWM minimum pulse width 10us. Working temperature -25 ℃ -80 ℃. Installation hole diameter: 3mm, attention should be paid to prevent short circuit on the back of the circuit, you can add insulation pad or copper column to raise the circuit board. 4. Suitable for motor parameters: Rated voltage 24V of the motor, the appropriate identification of rated power 115W and below or rated current of 7A or less the following long-term work of the motor. Rated voltage 12V of the motor, the appropriate identification of rated power 40W and below or rated current 7A rated below the motor for a long time full of work. Precautions: 1. Drive power must not be reversed, the proposed power connector in series 1 fuse, the voltage should be between 6.5 ~ 27V. If the voltage is over-voltage, power-on may burn module. 2. It is recommended that the rated output current of the power supply should be at least 2 times of the rated current of the motor so that the power supply can not supply the required voltage