Light color can be selected via RGB: warm white nuances, cold white, red, pink, yellow & other color gradients, dimmable, brightness control and many other options. This is always delivered in 50cm lengths. For example, with 5m you get 10 rail elements that can be joined together almost seamlessly. 8x12x500mm (width x height x length). *Cable extension: For safety reasons, we recommend always installing the power plug and the RGB control unit outdoors. Here you have the opportunity to do ours Extension cable as 3m or 5m To buy externally, you can find this under the eBay item number: 134367453279 or https://www.ebay.de/itm/134367453279 If you have any questions, we are available to give you advice and assistance at any time via email. You can reach our telephone support from Monday to Frid.