The method of use is very simple, just follow these steps:       (1)Dials at (0-0-0-).       (2)Put up the shackle to open the lock and rorate the shackle 90 and press all the way down. Hold on until Step3.       (3)Set your password.       (4)Tum the shackle back as normal then the setting is completed.  Alert IndicatorThis 3-Dial Travel padlock features an alert indicator that will turn red if opened by master key, alerting that the bag has been inspected. Unique Side Window Design PasswordThis customs lock design is ingenious, the password bar is designed on the side window for easy alignment and avoid setting the wrong password. At the same time, the white wheels with black numbers, easy to read in any environment.TSA CertificationThe optimizations and upgrades we make are designed to better protect your products and allow you to use our products with greater peace of mind.Multiple Uses-For outdoor and indoor useOur locks are not only used for luggage, backpacks, doors, cabinets, gym lockers, school lockers and even parking locks. For outdoor and indoor use, Easy to carry, it will not put you extra burden.