You get one piece of three different types: One is a short «joiner» — it can join two strips together. The second type is a long «joiner» — it can join two strips together 6″ apart. The third type is a «pig-tail», it gives you four stripped wires at the end that you can solder or plug into one of our controllers (also 6″ long).
When using our analog LED strip, you’ll have to carefully remove the waterproofing with a small hobby-knife. This will work with our 30 LED/meter or 60 LED/meter strip. It will not work with the digital addressable LED strip!
We have a tutorial on using these clips over at http://learn.adafruit.com/solderless-rgb-led-clips/