This is a commonly used DC motor driver module, using 293D chip small current DC motor driver chip. The pins are made for compatible, which also facilitates rapid for -based development for enthusiasts. 2 5V servo motor (servo) ports are connected to for 's high-resolution and high-precision timer - no jitter! Up to 4 bidirectional DC motors and 4 PWM speed regulation (about 0.5% resolution) Up to 2 stepper motors are controlled forward and reverse, single/double step control, staggered or microstep and rotation angle control. 4-way H-bridge: L293D chip provides .0.6A ( 1.2A) current per bridge and has thermal power-off protection, 4.5V to 36V. The pull-down resistor ensures that the motor remains stopped when powered on. Large terminal terminal blocks make wiring easier (10 - 22AWG) and power. 2 large terminal external power terminals to the separation of logic and motor drive power. Compatible with , Diecimila, & Duemilanove. size: 4 x 3.5cm Material: PCB colour: blue Package Contents: 3 x L293D Expansion Board 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.