AmzDeals 2-Pack RJ11 to RJ9 Adapter, Female RJ11 (6P4C) Jack to Male RJ9 (4P4C) Plug

works great

what i needed, works perfect

I wanted use jr11 cable to extend jr9 connection so I bought two of these to convert jr11 to jr9. But no signal. Had to return

good

Love/hate with these adapters. Bit too pricey for what they are, can't seem to find alternatives so guess I'm very happy they exist.First, these are not RJ11 to RJ9 adapters, they are RJ11 to RJ11 with a short piece of cord that has an RJ11 on one end and an RJ9 on the other. This can make things a little un-tidy at the ends of a project.I'm using these to adapt for an inverter remote where I already have an RJ11 buried in the wall, but the inverter uses RJ9 for the remote.You likely have already read about how easy it is to pop these in half and re-configure the wires, thankfully that is the case.Here's the BIG tip. If your installing where you need one on each end, as I do to adapt from the inverter to my RJ11 cable and from the end of the cable back to the remote for the inverter, then pay attention.If your install using one of these at each end does not work, modify ONLY ONE of these adapters internally (changing the order of the wires). If you modify both of them, you un-do the correction that has been made at the other end. Modifying only one also takes approximately 1/10th of the time as modifying two, troubleshooting, running back and forth to the install trying to figure things out and eventually realizing that you only need to modify one if it didn't work as purchased. Hope this helps someone ;-)

You can separate the two ends and reconfigure the wiring for your own specific use. Very simple to use and reliable.

i bought a rottery look a like phone that has a conversion in the bottom of the phone, and the output is this RJ9. this converter was necessary to hook it up to my Comcast box

So, this is an female to female RJ11 coupler with a RJ11 to RJ9 small wire. The one I got had the RJ11 and RJ9 crimped on in opposite directions so the wires get reversed (ie, coming in, the right most wire will become the left most wire).The coupler can be taken apart and the wires easily reordered in any order you want, so it is fixable. At first, due to the reversal this didn't work, but it seemed obvious from the flipped connectors that things were reversed so I took it apart and fixed it.This comes with no instructions nor any indication that wires are reversed, so make sure you know if your wires need to be reordered. (I used this for a controller on a swamp cooler rather than just cutting an rj11 wire and crimping on an rj9 connector since this was cheaper than a whole package of connectors, and in the end it worked).