... Humidity<90%.I/O Ports:1, VCC+:DC power positive poleNote:Must guard against exceeding 50V,so as not ... +,DIR-:Stepping motor direction input, voltage level touched off,high towards, low reverse7,ENA+,ENA-: motor free .NOTE:1 ... , When ambient temperature is high or working current over 2.7A, fix the module ... dimension Stepping motor driver,1.3A-4.5A,high quality and reasonable price