I bought three locks with a promotion code. In the picture has only two, because I lost and I can not find!
Each comes with a very badly written manual, but entirely possible to understand.
The default code is Zero-Zero-Zero, but it can be changed easily. For that you must insert a small screwdriver (or a clip) the button at the bottom when the lock is open. So you can change the numbers and put new code.
The lock is not very strong, but it's certainly more than enough to cause a disorder in the wise guys who wish to open your suitcase.
Very good product! Too bad you can't choose the color and so I ended up getting a blue, one green and one pink. I leave below the link to the store BuyinCoins. Enjoy and look for locks on AllChinese tool in all the Chinese shops at the same time!