Powered by 120V voltage, these LED under-counter lights can be directly wired or plugged in. When direct wired, this light can smoothly dim from 100% to 10% with compatible dimmers and has a beautiful appearance thanks to no wires being exposed outside. The plug-in method is super simple and doesn't need a transformer. Note: This LED under cabinet light is not compatible with TORCHSTAR's gun-safe lighting kit extension cable.