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Featuring two large external power terminals that ensure the separation of logic and motor drive power, this product is compatible with Mega, Diecimila, and Duemilanove, providing a full set of spare parts for DIY enthusiasts. Two 5V servo motor (steering gear) ports are connected to Arduno's high-resolution, high-precision timer - no jitter. 4 bi-directional DC motors and 4 PWM speed controls (approx. 0.5% resolution). 2 stepper motor forward and reverse control, single/double step control, staggered or micro-step and rotation Angle control. 4-way H-bridge: The L293D chip provides 0.6A (peak 1.2A) current per bridge with thermal outage protection,4.5V to 36V.