A "key" non-separable cable can change the combination to open the lock, turn the key, change the combination, put the key in the starting position. Supposed to prevent inadvertent change of the code.
Only surprise: according to the leaflet, the factory code is "0000". Not on the one I received, set to "2009". I had to go all the combinations between "0000" and "2009" before you can use it: it is of course possible to change the combination without displaying first good good ...