Size:1 to 4 cable This extra-thick 18 AWG input DC splitter cable and 20AWG DC output cable provide a better connection and superior performance. When used in LED light this type of splitter cable can maintain most brightness of your light compares to competitor cables the light will dim due to voltage drop. choose from 1 plug to 2 plugs or 1 plug to 4 plugs. DC plug size is 2.1mmx5.5mm.