2 Bit MAX7219 LED Display Control Board 8 x 8 Dot Led Matrix MCU Control Module 5V Interface Output Input Common Cathode Display Specification: 1. Can Be drive an 8*8 common cathode matrix 2. Module working voltage: 5V 3. Module size: 6.5 cm X 3.2 cm X 1.3 cm 4. With 8 fixing screw holes, aperture 3mm 5. Module with input and output interface, support multiple module cascade