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It would be like a walking stick. The stick that goes up there, that they swing back and forth and tap to see if there's anything in front of them. You got it, Bill. That's exactly what it is. There's a couple of different kind of blind people came and some of them have a ball on the end. And as it moves across the surface, it tells you a lot about what kind of surface it is. It also figures out whether there's something in your way. It is. It's a blind man's walking, moving along the street. All right. We're going to orange out the A3 and BK because he just got out of range, I think. I'll be my tram again. Oh, this is a good one. Stop. Okay. So, unresponsive this morning. All right, we're going back up to Peter. Peter, name this sound. Are you ready? All right. All right. All right. All right. All right. All right. All right. All right. All right. All right. All right. All right. All right. All right. All right. All right. All right. All right. All right. All right. All right. All right. All right. All right. All right. All right. All right. All right.