An attractive outdoor string light for everyone! These beautiful balls with light shine not only inside, but also outside! Explanation of the Starter and Extension kit: 1. Do you want to purchase the string light for the first time? Then choose a Starter kit first! This consists of a cable of 5 meters (which can be plugged in) + 2.4 meters of lights. If you choose a Starter kit, in this case you have a string of lights with 20 lights. 2. Do you want more than 20 lights on your string? Then you can choose to purchase an Extension kit. This is an extension (of 20 lights) for your Starter kit. You can expand the string of lights to a maximum of 60 lights! Attach to a USB or plug or a battery pack of your choice.