Features: 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.) Specifications: Item: 3D Printer Accessories Kit with: CNC- V3andUNOR3 andA4988 Driverand Stepper Motor Power: DC12-36V Note: Please allow 1-2cm errors due to manual measurement,please make sure that you do not mind before you order. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package includes: 1 x CNC-Shield V3.0- 1 x UNOR3 Board 4 x Motor Wires 4 x A4988 Drive Red 4 x 17HS4401S Stepper Motor 1x USB Cable