The track light should be installed on the matching track. The inside of the track contains voltage input (domestic is 220 V AC input, also can be customized into low-voltage input). There are conductive metal strips on both sides of the track (high-quality ones are made of copper, and poor ones are made of iron). There is a rotatable conductive copper sheet at the joint of the track lamp. When installing, the conductive copper sheet on the track lamp should be replaced Contacting the conductive metal strip inside the track, the track lamp can be powered on, and the track lamp can be turned on.