Stable performance A4988 Driver Chip is low power consumption and will not be too hot during use. The performance is more stable than chip. CNC V3.0 GRBL 0.8 -c compatible. (Open source firmware- running on UNO can convert G-code-commands into step signals) 4-axis support (X, Y, Z, a can copy X, Y, Z or create a complete 4-axis custom firmware- using pins- D12 and D13); 2 endpoints per axis (total of 6) Adopting a movable Pololu A4988 compatible stepper driver. (A4988, DRV8825, and others) Jumpers - set microsteps for stepper drivers-. (Some drivers, such as DRV8825, can execute -1/32 microsteps)The stepper motor can be connected to a 4pin-Molex connector or welded in place. Operates on 12-36V DC-power. (Currently, only the Pololu-DRV8825 driver can handle voltages up to 36V, so please consider the working voltage when supplying power to the circuit board.) Item:3D Printer Accessories Kit with:CNC- V3+UNOR3 +A4988 Driver+ Stepper Motor Power:DC12-36V Colour:As Shown Material:aluminum Package Contents: 1 set * 3D printer kit Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.