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Hi there, I am Pete and I'll be happy to assist you today.
The microphone on the HD 4.50 is very sensitive, and will pick up the slightest background sound.
To use the HD 4.50 for a Skype call, you will ideally need to be in a very quiet room.
If that is not possible, you can click the Microphone tab in Skype, and then the Microphone Boost button (the one on the right of the recording volume slide bar). Make sure it's set at 0 decibels. You can also choose to click the Noise Suppression button, which also helps reduce background noise for your microphone.
Let me know if that works for you.