As we all know, the modern telephone was invented by Bell. In fact, the telephone was invented by Edison. But Berby Edison filed a patent application two hours in advance, so he got the patent right first. But the telephone can receive and communicate clearly, which is attributed to Edison's repeated experiments, breaking through the traditional pattern and making a toner transmitter, which has improved the sensitivity, volume and receiving distance of the telephone in one fell swoop. Otherwise, we'll call now. Hey! I can't hear you. I can't hear you clearly.