This is cool. I'm not sure if I missed it, but did they address how a signal is generated by the array in the first place? My current understanding is that the

This is cool. I'm not sure if I missed it, but did they address how a signal is generated by the array in the first place? My current understanding is that the device will echo a signal back to the source, not propagate it forward or create a signal. Is it right to assume low power sensors exist and would be hooked up to this array, and then when the sensor triggers the array echos the signal to the other receiver?