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Some Walmart employees say customers are getting hostile at self-checkout — and they blame anti-theft tech
(www.businessinsider.com)
This is a most excellent place for technology news and articles.
Not all of them have mute buttons. My local grocery store used to allow you to mute the register but they disabled the function, I am assuming on the basis of reducing theft. When you're typing in a PLU for a given produce item, they want the machine to announce what it is so the self checkout monitor can hear if you rang your asparagus in as (much cheaper by weight) bananas. It also announces the price of whatever you just scanned in, which to me seems excessive.
This is just one store, though. There's another local grocery chain with better self-checkout registers that you can mute, but by default they don't even do all of the announcing that the other one does anyways. I try to support the store with the worse self checkout when I can because it is a union shop whereas the other is non-union, but it is frustrating as a customer when the non-union store is just a better experience most of the time.