About the Bar Graph Indicator...

Until your customer drops coins, an LED display scrolls the following message:

When the vac starts, the LED bargraph displays a countdown of remaining service. (Example: 50% remaining service)

Or you own custom message: (Example)

After your customer's time expires, the "X-TRA TIME" message scrolls for 20 seconds encouraging an additional purchase without having to restart at the full price.

After the "X-TRA TIME" message expires, an exit message scrolls.

(Example #1)

(Example #2)