Changmaker / Cash machine

When you go to a city,you may get into trouble for not having change,which always make
us late for the bus,or can’t go to the destination on time.
With Changemaker,you can get change easily,you just choose the change you want and
swipe your mobile ,you will get the change. It’s convenient for people to take bus with on trouble.
Also you can use the Changemaker -you have no small change-to buy water or newspaper.