The Core Hex Motor is compatible with the DUO Build System and features a 90 degree orientation and a female output shaft for maximum flexibility and ease of use. Insert any of the REV standard 5mm Hex Shafts into or through the Core Hex Motor to create custom length motor output shafts. The Core Hex Motor has a built in magnetic quadrature encoder which is compatible with 5V or 3.3V logic level devices including the Control Hub (REV-31-1595) and Expansion Hub (REV-31-1153).