Way out West (incorporating Way up North)

This idea is based on observation, and concerns RFID chips and card readers; those now ubiquitous devices that read your loyalty cards and bank cards (and protect high value items from theft). On the occasions that I have accompanied the aged parent to the shops, I have noticed that she struggles to hear the polite bleep that acknowledges the transaction. It's well known that as one ages the high frequency tones are the first to be lost, so the discreet noise that the readers emit is quite inappropriate. 

I have a number of suggestions to improve matters; 1) add a haptic response to the card reader, so you feel the acknowledgement as well as hear it, 2) make the tone lower and a couple of bleeps, so it isn't lost in the background noise of the shop, 3) make the illuminated keypad flash a couple of times, 4) make the whole tone louder (I appreciate that this is not a popular notion).