Aibecy 3D Printer Accessories CNC Shield UNO-R3 Board A4988 Driver Kit

Features:
CNC shield uses removable A4988 or DRV8825 compatible stepper drivers; the CNC shield extension board can be used for carving machine, 3D printer driver expansion board.
GRBL 0.8 compatible. (Open source firmware that runs on an Arduino-UNO that turns G-code commands into stepper signals); PWM Spindle and direction pins,4-Axis support (X, Y, Z , A-Can duplicate X,Y,Z or do a full 4th axis with custom firmware using pins D12 and D13).
Small size and compact design, Stepper Motors can be connected with 4 pin molex connectors or soldered in place.
A4988 Stepper Motor Driver mixes with slow current decay modes; internal UVLO and low RDS (on) output.
Automatic current decay mode detection/selection; synchronous rectification for low power dissipation.