Thos is a common anode 4-digit tube display module with 12-pin, with time display; TM1637 driver chip; Only need 2 signal wire to use singlechip to control 4-digit 8-segment digital tube; 4-digit common anode digital tube, 8 segment adjustable grayscale; Can connect to 5V or 3.3V power; 4-MS screw hole for convenient to install