Took me two tries, but worked fine on the second attempt. On the first attempt, I didn't insert the wires deeply enough.

I positioned the wires according to the pin numbers - not the colour coding, which worked fine for me.

The quality of this RJ11 jack product was really poor. The flexible tab broke after I removed the jack and inserted it to another slot in the wall plate. The color code was incorrect (thought the website had a note about it), and the colors on the attached schema didn't match the colors of my 4-wire phone cable.
I had to replace this RJ11 with voice grade jack I found in a local store, and this one had much better quality and clear instruction for both CAT5 and CAT3 wiring.
I definitely do not recommend this RJ11 jack.

Do not recommend. Poor quality.

I managed to get these to work, Although they can be a little difficult to get the wires installed. They do not want to stay in place as you install the other wires, but I figured it out.

Zero instructions.
Color coding is incorrect as is noted in the description. I am using wiring that has black, red, yellow, and green. Had to use an old connection to figure out proper connection.
A small screwdriver is needed to gently pry the clear cover off on the side where the jack is.
Sometimes the cutters will slice the individual wire insulation, sometimes not.
I would advise purchasing several of these so that eventually one will work. I bought 5 (because of the shipping cost) and the third one I tried did the job.
The guy who said that the wires should be laid out in the slots of the clear top first and then clamp the top and bottom together was 100% correct.

These are just ok, a lot more affordable then say Leviton, but you get what you pay for. I've done thousands of terminations to different styles and brands of punchdown Jack's and while these don't require punching down, they do require a little knowledge of RJ11 pinout as you can NOT go by the color code on the clear plastic cap (which is very wrong, almost not acceptable!). I'm surprised by now they have not corrected that in the manufacturing plant in China! Because these are cheap, I can't complain much and I've done enough to know how to properly do them as well as trim the excess wires with my micro cutters. Removing to clear cover is not so hard if you have smaller precision screwdrivers (flathead) and finger nails. I've had a few of these fail and had to toss and reterminate with a new one but still two of these are still cheaper then one Leviton!

The jack was reasonably priced. It did not require any tools to hookup wires to it. As advertised.

I installed four of these RJ-11 jacks. They worked but are just GARBAGE!

The primary problem is that the wires are not held securely; if you take the cap off for inspection the wires come off too. It's also difficult to clip the wires short enough that they won't touch yet still hold them in place until the cap goes on. That the color codes (as was noted) are wrong is simply perplexing; why didn't Monoprice refuse the order?

Extending my ethernet LAN and wanted to use an existing analog phone line's wire entry to avoid cutting an extra hole in the wall. Used a 2-port keystone wall plate. One port for the Cat6a keystonejack and the other port for this RJ11 keystone jack. Easy -- 1. snipped and divided the blue-red-green-yellow cable 2. placed the wires in the teeth going BRGY left to right 3. press the clear cap back on making sure the side tabs are locked 4. test with phone, then insert keystone into wall plate. Deducting 1/2 star because the color code taped to the device had wrong sequence (and Monoprice are correcting this in future batches) otherwise perfect. Don't need this part very often, but a simple solution when needed!

had a couple issues with wiring not working. figured out that it was not printed correctly. adjusted for the error - works great! 4 stars just for the headache.