10 meters 100 meters lights with tail plug, plug and controller, can be connected in series 10, 20 meters with tail can be connected in series 6. The light string only flickers and does not change color. The controller controls 8 flicker modes (default: European standard round plug, 110V American standard flat plug).Plug the outdoor use of the controller, plug and tail plug on the cover of tape or plastic bags, lights are waterproof string.