The magical item the Wand of Paralysis is extremely unclear as to how a person is to remove the effects of paralysis that the wand instills. In the DMG, page 211, it states "Make a ranged attack roll against that creature using your spell attack bonus. On a hit, the target is paralyzed for 1 minute. At the end of each of the target's turns, it can repeat the saving throw, ending the effect on itself on a success." The DMG fails to mention, however, what type of saving throw it calls for (whether it's dexterity, constitution, etc.), or how to determine the DC (whether it is your spell save DC or a predetermined DC for the item).
What is the saving throw to end the paralysis, and how do I determine the DC?