This document can be used to handle a variety of situations, and can be customized based on your need. You can grant a POA related to different areas of your life, with varying degrees of power for the agent, and for any timeframe that you desire.
A Non-Durable Power of Attorney is usually limited to specific situations and becomes effective immediately upon signing. It automatically ends when the specific situation is no longer in effect or when you die or become incapacitated. You can also rescind rescind it at any time.
A Financial Power of Attorney allows you to name your business or personal agent, someone who will make decisions or take actions on your behalf if you cannot. Your business or personal agent will make sure that your wishes are communicated to and taken into account by other parties. If you are out of the country when you are closing a business deal, paying a professional to manage your assets, keeping a personal assistant to do all of your banking and errands, or allowing your child to travel with a family friend, you can grant an agent power of attorney to sign documents on your behalf and/or make decisions for you.
A Power of Attorney is also not like a bilateral agreement, it is more of a unilateral description of what authority is permitted by the principal.