1. NoteOnly LED light set, not included 21338 Model sets in the package! Our lighting set Compatible with LEGO A Frame Cabin set is more concentrated, and the color of the light is more creative 2. Easier to Install, Perfect HidingWe use the design of integrated light line Compatible with LEGO A Frame Cabin. Lights cable are nicely hidden, almost no exposed line after installation. Reducing the difficulty of installation. In addition, we will provide pictures or video instructions 3. Multi Supply Methods The led lighting bricks kit could be powered by usb cable or battery. You could connect power bank, socket, computer to power the light through the usb interface. Please note that the recommended voltage is less than 5V. (The battery will not be included in our package) 4. Safety ABS MaterialDIY lighting kit are made of high quality copper lines and ABS plastic, they are antiheat and antiburning and can prolong their time for you. Smooth surface, not easy to break