... .Weight:<300g.7.Working environment:Temperature-15~40°C Humidity<90%.I/O Ports:1, VCC+:DC ... DIR-:Stepping motor direction input, voltage level touched off,high towards, low reverse7,ENA+,ENA-: motor free .NOTE ... driver, when users connect by mistake, the driver will not be damaged, but the electrical machinery runs abnormally, ... dimension Stepping motor driver,1.3A-4.5A,high quality and reasonable price