C.R.S. § 7-108-202

(1) Unless the bylaws require that the action be taken at a meeting, any action required or permitted by articles 101 to 117 of this title to be taken at a board of directors’ meeting may be taken without a meeting if all members of the board consent to such action in writing. (2) Action is taken under this section at the time the last director signs a writing describing the action taken, unless, before such time, any director has revoked the director’s consent by a writing signed by the director and received by the secretary or any other person authorized by the bylaws or the board of directors to receive such a revocation. (3) Action under this section is effective at the time it is taken as provided by subsection (2) of this section, unless the directors establish a different effective date. (4) Action taken pursuant to this section has the same effect as action taken at a meeting of directors and may be described as such in any document.