Grocery shopping made easy

For a while now, Stop and Shop has offered hand-held gadgets that customers can use to scan items while shopping.

The idea is two-fold: 1) by scanning as you shop, you can check out quickly and 2.) as you wander aimlessly around the store because you forgot where they keep the graola bars,  this gadget will make a noise and remind you of an item that's on sale in this aisle.
So, you've got this thing that sometimes makes a sound like a cash register and sometimes like a bell and it's supposed to make the shopping experience better, faster, and fun.
And, of course, I use it every time I go shopping. I doubt that it saves time or money, but it's a gadget. I do my shopping, put my stuff in the shopping bags, and show up at the self-service register, ready to pay my money.
There's long-standing tradition in the computer industry that, if a product doesn't work well, then we fix it documentation, giving users extra instructions that let them do something that should have been easy.
When you use the touch screen at the self-service register, it ask if you want to pay with credit card, debit card, cash, goat pelts, or some other option. Given that you just made your selection on one screen, you might think that these interconnected computer systems might be able to remember your choice. Nah. The card scanner asks you again whether you're paying with credit card or debit card.
Rather than fixing the system, it's a lot easier to put up hand-written instructions:

After that, in case you don't know that you need to use the electronic pen to sign your credit card transaction, another sign helps you.