This is one of the coolest tech gadgets we have seen. Each unit is hand made in the U.S.
You have a clock on stage covered with a cloth. A spectator is asked to name any time of day which the performer then writes on a clipboard for everyone to see. You now ask the spectator the significance of the time they selected (you could also continue to another effect then come back to the clock. In either case when you remove the cloth the clock is set to the time the spectator named.
The large clock is 12 inches in diameter. There is no force and no assistant is needed. This is a brilliant piece of technology!