The module is a 4 digit clock with 4 points of positive digital (0.36 inches) display module driver IC TM1637, only two signal lines can make SCM four 8-segment LED. Module features are as follows: Display of male red for the four digital tube Adjustable digital tube 8 gray Level control interface for 5V or 3.3V 4 M2 screws positioning holes for easy installation Control Interface: A total of four pins (GND, VCC, DIO, CLK), GND to ground, VCC is the power supply, DIO of data input and output pin, CLK is the clock signal pin. The module features as, Display of male red for the four digital tube Adjustable digital tube 8 gray Level control interface for 5V or 3.3V 4 M2 screws positioning holes for easy installation

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