Both parts are connected through a USB connector to your device such as a computer, laptop, etc.
When it comes to the USB headset, it is actually a combination of a headphone and a microphone. Many of them have amplifiers, which allow you to set the volume and tone of the sound. There are different types of headsets available on the market. Headsets are useful in optimizing the quality of sound and are easy-to-listen-to due to high-quality speakers.
