0.5W 8R 18mm Magnetic Speaker

The MAX7219 module is an integrated serial input / output common-cathode display driver, connecting the microprocessor and 8 bit 7-segment digital LED display, and can also connect a bar graph display or 64 separate LED.
Features:
An integrated serial input / output common-cathode display driver, connecting the microprocessor and 8 bit 7-segment digital LED display, and can also connect a bar graph display or 64 separate LED.
With an on-chip type B BCD encoders, multi-channel scanning loop, segment word driver, and a 8 * 8 static RAM for storing each data.