Price per 4 incl. bidding cards
The main advantage is that all cards are clearly in view. The help-cards (Tournament Director, Stop and Alert) have a special compartment. The Alert-card may also be put in a special slot on the back of the box (see illustration).
The video clip (below) shows how it is set up.
When not in use, the Pocket Box is so small that it can easily be carried in a pocket.https://youtu.be/1ViKdbg-ys8