You can log in to the company's website www.cmr-cctv.com, in the product center, enter the corresponding product model in the product search box, click search, and you can see the specific parameters under the "lens" catalog of detailed product parameters.

[As shown in the figure below is a fixed-focus camera, the focal length is a fixed value, not variable]

[As shown in the figure below is a zoom camera, the focal length is adjustable within a range]