Maybe this will help:
CCR T14-353. Methods Authorized for Taking Big Game.
(j) ...Except as otherwise provided, while taking or attempting to take big game under the provisions of this section or Section 354 of these regulations, it is unlawful to use any device or devices which: 1) throw, cast or project an artificial light or electronically alter or intensify a light source for the purpose of visibly enhancing an animal; or 2) throw, cast or project an artificial light or electronically alter or intensify a light source for the purpose of providing a visible point of aim directly on a animal. Devices commonly referred to as “sniperscopes”, night vision scopes or binoculars, or those utilizing infra-red, heat sensing or other non-visible spectrum light technology used for the purpose of visibly enhancing an animal or providing a visible point of aim directly on a animal are prohibited and may not be possessed while taking or attempting to take big game. Devices commonly referred to as laser rangefinders, “red-dot” scopes with self-illuminating reticles, and fiberoptic sights with self-illuminating sight or pins which do not throw, cast or project a visible light onto an animal are permitted.
The Garmin Xero A1/A1i is technically a bow sight with a built-in laser range finder. It does not enhance the visibility of the animal (in low light conditions such as a night vision scope), nor does it cast a visible light for a point of aim directly onto the animal (such as a laser sight).
Given the above, you should be good in California.
(Taken from the "California Mammal Hunting Regulations 2019 - 2020") - California Department of Fish and Wildlife (website) / Hunting / Regulations / Mammal Hunting / Booklet .pdf
Interestingly, California has fairly lax regulations regarding archery hunting big game. The regulations favor (or are silent) regarding the use of: lighted nocks, mechanical broadheads, full or swept blades, electronics mounted on bow (i.e. rangefinders, cameras, etc), illuminated bow sights. There are some states that don't allow any of the aforementioned items.
