Every kit is fully Plug-and-Play, allowing a quick and easy installation. This is because LED lights convert maximum energy into lights-where as incandescent converts only 20 percent of energy into light.
Kit contains (8) 194 style bulbs. I used 4 in the doors. All 4 roof dome lights use bayonet style bulbs. So basically I paid $10 for 4 led door bulbs. Don't waste your money on this particular kit.