Hi there,
There are 2 main types of power of attorney, (1) general and (2) enduring. The types of powers that you can give to another person differ from state to state.
If you are anticipating that you will only need someone to act on your behalf in relation to financial or property matters, a general power of attorney will probably suffice. It allows your attorney to make financial and legal decisions for you, for a specified period of time while you are overseas. A general power of attorney does not give an agent the power to make personal, medical or lifestyle decisions on your behalf. An agent's appointment will become invalid if you lose the capacity to make your own decisions, so the powers granted cease if you become mentally incapacitated.
What state are you located in?
And what matters do you require your attorney to deal with in your absence?