Most wired headsets (like the ones we use) take the signal (your voice) from the microphone, amplify it, and place it on the audio line that's connected to all headsets. The same headset then takes the same signal from the audio line, amplifies it, and routes it to your earpiece(s) so you can hear yourself. That signal coming back through your earpiece is called sidetone.

If you have sidetone when you speak, then you know your headset is working properly. If someone else can't hear you, or you can't hear them, you know the problem isn't in your headset (because you've got sidetone).

The wireless headsets do it slightly differently. All headsets running off the same base unit transmit to that unit on different frequencies. The base unit takes each incoming transmission (from whatever "talking" frequency it's on) and retransmits it on one common "listening" frequency. All headsets on that base unit "listen" on that same frequency. The headset amplifies the signal on the "listening" frequency and routs it to your earpiece(s). So, once again, if you have sidetone (you can hear yourself) on your wireless headset then it's working properly.

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