Bests & Worsts Reviews from Amazon

There is apparently a lot of confusion over what these adapters can do. I believe the problem is that there are two different wiring standards (pin-outs) for 2.5mm audio plugs and jacks: stereo headphones (two earpieces and no mic) vs. stereo or mono telephone headsets (one or two earpieces and a mic). The 2.5mm male plug's tip and rings are the same dimensions/position, but wired differently. On a 2.5mm plug with a tip and two rings, the contacts can be wired as earpiece, mic and common, or as left earpiece, right earpiece and common. You'd need a 2.5mm plug with a tip and three rings for a stereo telephone phone headset, just like the 3.5mm version. Thus, an adapter such as this one will only work with one type of connection, and you cannot tell by looking at it. To make matters worse, some products come with audio controls (mute, forward/reverse or stop/start), and those standards vary. THIS product does work to convert a mono, 2.5mm plug-equipped headset (earpiece and mic) to work with a 3.5mm jack, such as that found on an iPhone or certain iPod Touch models (like my 4th gen). It does NOT work to convert a stereo 2.5mm plug headset (two earpieces and no mic) to play stereo from the 3.5mm jack. I don't have a stereo 2.5mm telephone headset, so I can't test that combo, but it should work. This is not a fault of this product; it's the fault of the lack of a standard for 2.5mm plugs. I hope this makes sense. SO, if you have a 2.5mm plug, wired telephone headset you'd like to use with a 3.5mm jack-equipped device, this is the adapter to buy.