The phrase "to set any combination" refers to the act of choosing a specific set of numbers, letters, or symbols in order to open something, like a lock or a safe. It means you have the ability to decide the code yourself. Full definition
It offers 32 different setting combinations in total, which can feel a bit overwhelming at first, but once you dial in exactly what works best for you, you're all set. (momming.com)
Set a combination anywhere from three to eight digits long. (geekwrapped.com)
Each pumping session can be personalized with the AdvancedControl ™ technology, which creates 32 unique setting combinations of speed and suction for optimal control. (evenflofeeding.com)