Summary: I bought this one and the Olympus TP-8 Telephone Pick-up Microphone Device both from Amazon. I tested them both. They work well. conversations are clearly replayed on my recorder. worth it. I like the Philips better just for the roll-up thingy that makes storage a little more convenient. Also, the philips came with a little black pouch for storage. a plastic bag also works but they put a little bit of effort into it, at least.
Summary: Please, just buy this microphone if you really need it. If you find any similar, don't waste your money buying this one. I don't know where philips found their engineers, but they are really bad. This is the second of this microphones I bought in 2 months. It's cable is so thin that even taking good care it tears apart. Philips, please, stop doing electronics. YOU DON'T KNOW HOW TO DO IT. all your things are really bad quality.
Summary: This works as advertised. I discovered that if I placed my regular microphone in my ear, it would do the same thing so really did not need this piece, however that's my fault not the manufacturer's.