Specifications:Material: PCBWorking Voltage: 5VItem Size: 128 * 38 * 13mm / 5.04 * 1.49 * 0.51inItem Weight: 50g / 1.76ozPackage Weight: 53g / 1.86ozPackage Size: 18 * 9 * 2cm / 7.09 * 3.54 * 0.79in Features:With 64 fixed screw holes with a diameter 3mm.With input/out interfaces, support for cascading multiple modules.A single module can drive a 8x8 dot matrix common cathode.Module measure size in 128*38*13mm(5.04*1.49*0.51in).Operating voltage: 5V.