People stand around the table and click a button in their shoes at each moment the ball runs over a chosen number. As the ball slows there is an estimation of where on the wheel it will fall and the bet can be made before the ball stops.

Sometimes another person clicks a button as the wheel does an exact rotation. A computer in the pocket of perhaps a third person calculates the ball’s eventual rough location.

It improves chances to a level where money can be made but its not instant cash. Casinos check to see if players bets are observed to be at exact moments in time and if radio or other devices are present in the room.