A truly revolutionary system of lighting. Line-voltage 120/110v (no transformer needed). Link up to 20 strip lights in series off one power connector. Dimmable, efficient, and long lasting. ETL APPROVED Transformers generally burn out and one of the main reasons why you want to buy our kit is because there is no transformer needed. The light can be connected into a 120/110V line. The second reason to buy this kit is because the lights are dimmable to create a lighting mood.