We have a POS till system that has a printer that is linked to it and connects to our PC, I imagine many people migrating to Fresha will have a similar setup and thought it would be helpful if:
1. We could unlock the till with a 'no sale' button or something similar
2. We didn't have to print an invoice for the till to open after an invoice has been completed - its a waste of paper when the clients don't want one and we can in fact send them by email.
I've seen that Fresha suggest we use a key-lockable till box which sadly isn't safe enough on a high street.