Splitters - Customers who purchase 100 or 150 lights will get a splitter with their package. The splitter allows you to run 2 or 3 channels with your lights. There are 2 reasons to have a splitter. First, in many cases it is easier to handle short wires than it is to handle long wires. Second, the lights look better. The longer a line goes, the dimmer the lights get. The splitter eliminates that problem.
Feel free to connect these wires end to end if necessary, but you will notice some light loss from the first strand to the last strand.