It is a simple to use stepper motor driver, compatible with most microcontrollers that can output a digital 0 to 5V pulse (0 to 3.3V pulse if you solder SJ2 closed on the EasyDriver). The module requires a 7V to the 30V power supply for a motor. The module has an onboard voltage regulator for the digital interface that can be set to 5V or 3.3V.
 
Power supply: 7V to 30V.
The higher the voltage, the higher the torque at high speeds.
Adjustable current control from 150mA/phase to 750mA/phase.
Logic voltage: 5V or 3.3V.
A3967 microstepping driver.