Up to 4 bi-directional DC motors with individual 8-bit speed selection (resolution of about 0.5%) Up to 2 stepper motors (unipolar or bipolar) with single or double coil, interleaved or micro -steps 4-way H-bridge: the L293D chipset provides 0.6 A per bridge (1.2 A at peak) with thermal protection, can operate motors at 4.5V at 12V 2 connections for servos 5 "hobby" connected to the Arduino's dedicated high-resolution timer - no jitter! Tested compatible with Mega, Diecimila and Duemilanove.