Specifications: CNC Expansion Board:
Version: V3.0
Color: Red
Size: 68 x 53 x 18mm / 2.67 x 2.08 x 0.7"

Voltage: DC 12V to 36V (only DRV8825 driver can handle up to 36V, so please consider voltage for power supply)
4pcs A4988 Driver:
Color: Red
Size: 20 x 15mm / 0.78 x 0.59"
Thermal Shutdown Circuit: Yes
Cross Current Protection: Yes
Ground Fault Protection: Yes
Short Circuit Protection: Yes
Compatible Logic Voltage: 3.3V and 5V
Five Step Modes: Full, 1/2, 1/4, 1/8 and 1/16
Mix with slow current attenuation model.
Internal UVLO and low RDS (on) output.
Automatic current attenuation mode Detection/Select.
Phase-in rectifier, low power consumption.
Warning: Connecting or disconnecting stepping motor while driver is powered on might damage driver.
4pcs Heat Sinks
Size: 8 x 8mm / 0.31 x 0.31"
Color: White

Package Includes:
1 x V3 Extension Board
4 x Drivers
4 x Heat Sinks