Corresponds to my needs, but beware, 15 cm is short!
This red cable allows me to quickly identify a particular connection behind my FreeBox to connect a mini-switch.
When I took it out of the package, I found it really short! In fact, exactly 19 cm from the end of one RJ45 socket to the other. 15 cm is the length of the cable strictly, without the connectors (metalized parts on the picture).
But in the end, the length is exactly what I needed. And it works as expected, so nothing to say.