1. 24V-110V DC/18V-80V AC power supply 2. H-bridge bipolar constant phase current drive 3. current can be up to 7.2A eight output currents can be selected 4. 15 subdivision modes selectable up to 128 subdivisions 5. input signal high-speed opto-isolation standard single pulse interface off-line hold function large cooling fan for efficient heat dissipation to provide energy-saving semi-automatic current lock function. built-in temperature protection and overcurrent protection Colour:Black Material:ABS Package Contents: 1 * Stepper Motor Driver with Fan 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.