Slabinou běžného telefonu bez telefonu

Normal home-use hand-free telephone will use microphone with low sensitivity,so user must speak nearly in front of microphone which restricts its apply distance.Otherwise,the people will find the volume is too slight to hear after picking up.Normally hand-free telephone will use half-duplex communication technique.When people are on the line,one side can hear the sound while other side can’t.As a result,the information of the dialogue lost too much for two side to transmit the conversation content.This kind of telephone isn’t suitable for conference,it will influence the efficiency of a meeting.Hand-free use low power speaker,it is obvious that people who are far away from telephone will find the sound far beyond clear.Therefore,a normal hand-free telephone only suits for a quiet place or slight noise.