What are the requirements for a real estate employment agreement?

All real estate employment agreements shall:

(1) Be written in clear and unambiguous language;

(2) Fully set forth all material terms, including the terms of broker compensation;

(3) Have a definite duration or expiration date, showing dates of inception and expiration; and,

(4) Be signed by all parties to the agreement. (A.R.S. § 32-2151.02.A)