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Single module can have an 8 x 8 common matrix. Module operating voltage: 5 V. With 4 fixed screw holes, aperture 3 mm. Module with input and output interface, support several modules cascade. Integrating serial input/output common cathode display driver, connects microprocessor to 8-digit or 7-digit LED display, bar graph display and 64 red LED., Manufacturer: HALJIA