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First, choose your headset wearing style.

Next you will be able to choose your telephone dial pad.

Click one of the following.
One Ear
If your office is quiet, or you need to be able to hear people around you while on a conversation then a monaural single earpiece is a smart choice. Generally less expensive than the 2 ear models and can be worn on either ear.
Two Ear
If you are in a very noisy office or call-centre then you would probably benefit from a binaural headset as the dual ear pieces will keep outside noise out enabling you to concentrate more fully on the person you are talking to.