You can spend your Supercard points in any Coop City store on non-food items. 1000 points = 1 CHF I believe. You can also sell them
Coop has machines that read the card and tell you how many points you have. Or buy something in Coop and swipe your card - the receipt will tell you how many points you have. They can also tell you at any counter how many points are on the card by swiping it.