Feature:
Display device is 4-digit yang red digital tube.
Digital tube 8-level grayscale adjustable.
The driver IC is TM1637, only two signal lines can make MCU control four Digit 8-segment LED. Can be used to display decimal, letters and so on.
4pcs M2 screw holes for easy installation, hole diameter is 2.2mm.

Parameter:
Working Voltage: 3.3V / 5v DC
Working Current: 30 / 80MA
LED Display: 0.36 inch
Color: Red
Size: 42 x 24 x 11mm / 1.65 x 0.94 x 0.43 inch

Connect method:
GND—ground (GND)
VCC--power supply (3.3V to 5V)
DIO--data input and output (D2)
CLK--clock signal pin (D3)

Package Included:
3 x TM1637 4-digit 0.36in LED digital display Module Digital Tube Display Module