This is adafruit part number 1004.
These ingenious little clips make it easier than ever to use our analog RGB LED strips - no need to solder! The clips snap onto the ends of the LED strip and hold securely. They're not waterproof but you could cover them in heat-shrink to make them weatherproof.
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 strip. They will not work with the 3-wire NeoPixel LED strip or DotStar 60 or 144/m!
We have a tutorial on using these clips over at http://learn.adafruit.com/solderless-rgb-led-clips/