SERVO42A closed loop stepper motor  Features Easy to install Configuration via the serial port debug assistant Input voltage: 12 V-24 V. Maximum input current: 2 A. Closed loop feedback frequency: 6 kHz. Accuracy: 0.1125 degrees. Microsteps: 16,32, 64, 128,256 Color: black. Material: plastic + metal. Package contents 1 x SERV042A stepper motor 1 motherboard adapter. 2 x connection cables (USB 2.0 microUSB cable)