The truth is even more bizarre....
Instead of Voltage and Frequency information, I read the following:
ENGINEERING SAMPLE. NOT FOR SALE
NOT WORKING UNIT
Fortunately, this was Thursday evening - late night shopping here. After showing the mum, I told her to take it back and see if they could get it working.
She told me it took a third member of staff to find the problem (this was a Chemist/Pharmacy, BTW).
After a credit on that purchase, she bought another model and when she was asked if she wanted to test it, she responded with a quite assertive YES!. Apparently the person who served her was taken aback a little by the intensity of the response.
When she asked about replacing the medication that had been wasted, they apparently said they couldn't do that and would have to contact the owner the next day.