A key and lock set include: an electronic key without a built-in a power source; a lock openable by the electronic key but not openable by a mechanic key, having a power source shared with the electronic key; and an electronic key reader configured to read an identification of the electronic key; wherein: the lock is configured to be opened by the electronic key upon the identification matches an identification of the lock; and the identification of the electronic key and the identification of the lock are programmable and configured to be paired.