The module and its libraries are compatible with Arduino UNO, Leonardo, DUE
8 adjustable gray;
Power Supply should be 3.3~5.5VDC;
Logic level of the interface can be 3.3V / 5V;
4 screw mounting holes whose diameter is 2.2mm;
- See more at: http://www.ewallpk.com/home/1265-battery-style-digital-tube-led-battery-level-display-arduino-rpi-stm32.html#sthash.VybWDiWR.dpuf