For my Siemens C455 I bought for me three different Hama Headset. Besides, I have my girlfriend also gave the headset discussed here. All headset worked very well in the beginning but after 6..9 months it was over with the call. Three times was the microphone (noise, tinny, soft) up the ghost, and even broke the speakers. I'm not a lot of telephone (five calls per week with together a talk time of two hours), so I can not this Hama Headset friend.