What is TSA lock?
If you are going to the United States, your luggage must have a TSA lock. Customs inspectors can use a special key to open the TSA lock for inspection, to avoid forced unpacking and damage to the luggage.
How to set the password of TSA lock?
There are 2 kinds of TSA lock.
Under the correct password state, press the small hole in the vicinity to turn the digital gear to modify the password, and release the hole.
Under the correct password state, toggle the switch at the bottom of the lock, turn the digital gear to modify the password, and toggle the password bottom switch back.