The module is based on a decimal point display module, it displays four digital tube (0.56 inches), and driver IC is TM1637, only two signal lines can make MCU control 4-digit 7-segment LED display. Can be used to display decimal, letters and so on.

The features are as following:

1. 4-digit blue common anode display

2. 8-level adjustable luminance levels

3. Power supply should be DC 3.3~5.25V

4. Interface level can be 5V or 3.3V

5. 4-screw mounting holes whose diameter is 2.2mm

6. Works with official Arduino boards