MAX7219 digital display control module
This module is compatible with 5V and 3.3V microcontrollers.
You can use it for Arduino.
MAX7219 is an integrated serial input/output common-cathode display driver, which connects your microprocessor to a 7-segment digital LED display with 8 digits.
Only three I/O ports are used to drive the eight-digit display. MAX7219 supports flicker-free displays as well as cascading displays.

Wiring instructions (for example, it can connect to any I/O port; modify the port definition in the program):
VCC: 5V
GND: GND
DIN: P00
CS: P01
CLK: P02


Specifications:
Material: PCB + Electronic Components
Power: 5V
Size: 82*15*12mm (L*W*H)
Shell Color: Blue & black
Net Weight: 13g