The locks are TSA (Transportation Security Administration) and Travel Sentry Approved. If Transport Security Officers want to access your bag then they will use their special key to open the lock and relock it when they are finished. Your suitcase will not be forcibly opened to avoid damage.So there is no key inside the package! 4-digit passwords offer 10,000 different password combinations. No key required, so you do not have to worry about the risk of losing the key. Adopt environmental protection paint process, zinc alloy shell, zinc alloy lock core,which is delicate and durable.High strength zinc alloy can withstand falling and knocking without damage.It is a safe and reliable protection for your luggage and lockers.