TSA APPROVED: The luggage lock is accepted by TSA, allowing TSA inspectors to unlock luggage with an official security screening key. With ZHENGE suitcase combination lock, you need to lock it again before you can remove the key, so your belongings are always protected. And if the lock is ever opened, the red opening alarm indicator will pop up to let you know as soon as you pick it up at the airport. EASY TO USE: Code setting is easy with the flip-and-set button on the bottom. See the back of the packaging for instructions. High contrast of white numbers on black wheels makes reading easier. Equipped with an advanced dampening device that clicks into place with each dial to improve alignment accuracy. It is a user-friendly TSA lock code that is suitable for both young and old. SAFE & ROBUST The TSA 4-digit combination lock allows you to set your own code with 10,000 options. This is ten times more secure than a 3-digit suitcase lock. Constructed from high-strength zinc alloy, the TSA luggage lock is tough enough to withstand even the toughest luggage conditions. The slide open feature is advanced and unique in the market. It is highly resistant to mechanical and forced unlocking. FLEXIBLE CABLE: The flexible cable can be routed through all standard size zippers on suitcase, backpack, duffel bag, and briefcase etc. With a total length of 5.5 inches, the reinforced cable can connect 2-3 sets of zippers at a time to secure the whole case or bag. It's not only a TSA luggage lock for travel, but also a perfect locker padlock for gym, school, drawer, tool box, closet, etc.