I was at the grocery store and the clerk could not open his register to put the money away or give me change. He called someone and turned on and off the thing. It did not work. He finally got it open but then could not give me a receipt. I had to tell the guard at the door that he could not full it out because they check them when you leave. Poor guy. I hope as the day went on it got better for him and does not happen to him often.