4pcs MAX7219 dot matrix 8x8 8*8 led display module Arduino Raspberry pi

Description: This module is based on the MAX7219 chip which is a compact, serial input common-cathode driver that interfaces microcontrollers to LED matrices. All common microcontrollers can be connected to this module by using a 4-wire serial interface. Each output can be addressed without refreshing the entire display. This module requires only 3 I/O lines for driving the display, making it ideal for your microcontroller projects. - single module can drive an 8 x 8 dot matrix common cathode led - module operating voltage: 5V  - module dimensions: length 3.2 cm X 3.2 cm wide X 1.3 cm high  - 4 holes diameter 3 mm  - support for cascading multiple modules    Package included:  4 x MAX7219 dot matrix led module Arduino