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 Emerald-green 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