Specification Brand : Generic BulletPoint : MAX7219 LED Dot Matrix 8 Digit Digital Tube Display Control Module For Arduino 3.3V 5V Microcontroller Serial Driver 7-segment ItemName : Generic MAX7219 LED Dot Matrix 8 Digit Digital Tube Display Control Module for Arduino 3.3V 5V Microcontroller Serial Driver 7-Segment ItemTypeKeyword : led-segment-displays Manufacturer : Generic Material : Copper PartNumber : YGQ_MODULE_10307 ProductDescription : Features : MAX7219 digital display control module This module is compatible with 5V and 3.3V microcontrollers. You 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 IO 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 any IO port, modified the Port Definition in the program): VCC: 5V GND: GND DIN: P00 CS: P01 CLK: P02 Notes: VCC and GND should not be connected reversed, so as not to burn the chip Specifications: Material: PCB + Electronic Components Power: 5V Size: 82*15*12mm(L*W*H) Shell Color: Blue & black Net Weight:13g Package Included: 1PCS * MAX7219 LED Dot Matrix 8 Digit Digital Tube Display Control Module For Arduino