With VoIP on the rise and teleconferencing over the web, youneed to have a good quality input device. A headset typically sitson top of your head allowing you to talk into it. A microphone isusually held in the hand or put on a stand to mount on the desk. Ifyou want to make the decision on what you need, take some thingsinto account before buying. You want to have a good frequencyresponse rate of 100 hz- 8 kHz. Any lower, and you will not get thedevice to pick up on all the frequencies needed to record yourvocal conversations.An omni-directional microphone picks up sounds from alldirections, which can be good. Although a unidirectional microphonepicks up frequencies from one direction, they can both have theiradvantages and disadvantages. Omni microphones will pick up morenoise in the room