CNC Shield Version 3.0 for ArduinoGRBL 0.9 compatible4-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)2 x End stops for each axisCoolant enableCompatible with A4988 or DRV8825 stepper driverWorking Voltage: 12-36V DCMax. Working Current: 2.5ARAMPS 1.4 Mechanical Switch EndstopRed: VCC (ramps )Black: GND (ramps -)Green: SIGNAL (ramps s)DRV8825 Stepper Motor DriverSize: 1.5mm x 2mmUpgraded from A4988Maximum Current: 2.5A32 Subdivision: 1, 1/2, 1/4, 1/8, 1/16, 1/324-layer PCB board for better heat dissipationSuitable for driving stepper motors up to 8.2V~45V, 2.5ANema 17 Stepper MotorModel: 17HD48002H-22BRated Current/phase: 1.7AStep Angle: 1.8 deg.Holding Torque: 59Ncm(84 oz.in)Frame Size: 41 x 41mmBody Length: 47mmShaft Diameter: 5mmShaft Length: 22mmLatest CH340G CNC Shield expansion board Version 3.0 for Arduino, and compatible for GRBL 0.9.UNO R3 BoardMCU: ATmega328USB interface: ATmega16U2 cable with USB .This is a professional sensor kit for UNO R3. New and upgraded, we provides various components or sensor module, with which you will find it easy for you to complete every experiments or learning. All these are packaged in a portable case, easy to carry and storage.What’s in the box?1 x CNC Shield V31 x UNO R3 MEGA328P CH340G with USB Cable5 x DRV8825 Stepper Motor Driver with Heat Sink5 x RAMPS 1.4 Mechanical Switch Endstop5 x 3pin Cable (70cm)3 x Nema 17 Stepper Motor3 x Nema 17 Mounting Bracket