We're seeing RJ11 cables being used more and more in the maker world - from the Elecfreaks range of micro:bit components to RJ11 breakouts for passing signals and power. There's even a SparkFun MicroMod Weather Carrier board that uses them!
They're also exceptionally handy for their original intended purpose of course, as a cable for your modem!
- RJ-11 to RJ-11
- Copper cores
- 2m long