... operation Universal power window kitNew design, less friction, more power, longer life operationConvert any crank-style window to power windowUniversal features, fits any car and vanTwo doors ... hardware for easy installation and quiet operationOperating voltage: 12V DC ± 2VAvailable models:o JQ-PWK-2B: 2 doorso JQ-PWK-4B: 4 doors SPAL type Universal Power Window Kit for 4 Doors