This is extremely important for retailers when scanning items.
The clover system only has one sound, a beep, anytime an item scans. The problem is when an item does not have a price attached to it still makes the same beep sound. So if you are scanning multiple items you may miss one. To resolve if item does not have price make a different noise to let retailer know a price has not been logged for this sale item. Otherwise if retailer does not notice item will go out the door without money being collected if its mixed in an order with item that do scan with price.