Although there are some variations how these systems operate, they all make use of a special provided microphone that is placed in the listening position and also plugs into the receiver.
Ọ bụ ezie na e nwere ụfọdụ ọdịiche otú usoro ndị a si arụ ọrụ, ha nile na-eji okwu okwu a na-enye akpanyere nke a na-etinye na ọnọdụ nge ntị ma na-abanye n'ime onye nata.