Attunement

Certain magic items require a user to attune to them before their magical properties can be used. Attuning to a magic item requires that you spend a short rest concentrating on it (this can’t be the same short rest used to learn an item’s properties). Depending on the nature of the item, this concentration can take the form of prayers, weapon practice, or meditation. In any case, the concentration period must be uninterrupted. Once you are attuned to an item, you can use its magical properties.

An item can be attuned to only one creature at a time. A creature can be attuned to no more than three magic items at any given time, and you can attune yourself to only one item during a short rest. Your attunement to an item ends when the item has been more than 100 feet away from you for 24 hours and when you die. You can also voluntarily end your attunement to an item with another short rest.