The Noken is an amazing device. It is your best friend at the supermarket (except your wallet). No more searching for coins to unlock the shopping cart, the Noken will do that easily. And even more, you can extract the Noken instantly from the cart. This way you will never loose it or leave it in the cart. You don’t even have to return the cart to the corral if you don’t feel so ( it’s raining, you’re in a hurry, you are too lazy and so on).