The keychain is very durable and very light (2g), the inscription will never be erased. Using the keychain is VERY simple, insert it with a semicircular side into the slot of the lock instead of a coin of 10 rubles or 1 euro and unlock the lock and immediately pull it out, leading the keychain a little to the left or to the right. Use the cart. After unloading your goods, the cart must be returned to the parking space! The keychain is not intended for “brazenly” throwing carts WHERE IT GETS, but only helps to rent a cart in case you do not have a coin of 10 r or 1 euro.