It says for razr, krzr k1m, etc. but this is false. I contacted motorola about this product and they said it's NOT made for these phones and that I needed the 2.5 mm headset adapter (no microphone support) to use with my krzr k1m phone. My friend also tried to use it with his razr v3m. It failed there as well. Maybe it works with slvr or rokr, but if you have a razr or krzr, save your time and money.