A couple of months ago I got a lot of vintage magic at a garage sale and one of the things was a vanishing alarm clock stand (no clocks). I also have a lot of remote control units here, so I made a remote control alarm clock:
When you push the button the alarm rings
I’m not sure how I’m going to do this in the show. Traditionally you cover the clock and hang it from the stand. When you hang it, it starts ringing and you pull away the cloth and the alarm clock is gone. Then the alarm clock reappears somewhere else. I think I’ll use the remote control alarm clock as the one that reappears and the ringing is how it will announce it’s reappearance.