Stepping Motor Driver, Phase Two, Amps per Phase 2 A, 100-220 V AC, Unipolar, Mounting 2-Hole, Number of Microstep Divisions 1, 2, 4, 5, 8, 10, 16, 20, Maximum Input Pulse Frequency 50 kpps, Minimum Input Pulse Width 10 msec, Mounting Pattern 3.799 in on Center, Number of Mounting Holes 2, Mounting Hole Centerline 3.799 in, Overall Height 4 1/8 in, Overall Width 1 9/16 in, Overall Depth 3 1/16 in, Standards CE, RoHS