Cal. Bus. & Prof. Code § 7599.54
(a) Except as provided by Section 7599.56, every agreement, including, but not limited to, lease agreements, monitoring agreements, and service agreements, including all labor, services, and materials to be provided for the installation of an alarm system, shall be in writing. Except as provided by Section 7599.56, all amendments subject to the provisions of this section to an initial agreement shall be in writing. Each initial agreement shall contain, but not be limited to, the following:
(1)
(10) In addition to the above, every initial residential sales and lease agreement, the total cost which over the time period fixed by the agreement exceeds two hundred fifty dollars ($250), including the cost of all labor, service, or material to be provided by the licensee for the installation, shall include, but not be limited to, the following: