When the lights go on Watson receives an electronic signal.

This time I put the key into the door, to try to cut down on the profusion of electronic signals flying around.

I frowned, trying to turn the chatter of electronic signals into something that made sense to my eyes.

His only job was to send his single electronic signal when the two were in the same room.

"Can you pick out the one that doesn't have an electronic signal?"

He had also turned off the radar, the radio, and anything else that might send out a recognizable electronic signal.

It can be opened only from inside, or by electronic signals, which I'm sure you don't give a hoot about.

First, the electronics system turns the image into an electronic signal.

By using a speaker, the electronic signal is changed to voice.