Is it one-way or two-way ? If one-way, the next interesting thing would be to record and playback the signal. Once we're able to record and playback, there ar

Is it one-way or two-way ? If one-way, the next interesting thing would be to record and playback the signal. Once we're able to record and playback, there are many possibilities because it can also be transmitted anywhere and even to multiple receivers, thus having a new medium of communication.