DRV8825 stepper motor controll electronics.
The DRV8825 controll module integrated with Texas Instrument DRV8825. - power source: 8.5V-45VDC - current: 1.5 - 2.5A - step count: Full, 1/ 2, 1/ 4, 1/ 8, 1/ 16, 1/ 32 - Overheat protection: Yes - Overvoltage / current protection: Yes - Missconnection protection: No - Error indication: No - Weight: 0.3gramm
The module not contains optocuplers, proper isolation should be done by user if needed.