Can this wall timer be produce in brown?

No, however you can spray-paint it to match any decor with careful painting.

Before you install it, very carefully mask the window, the button, the connections, etc. with blue masking tape. Then very carefully and lightly spray paint it brown. Be sure to use a light touch and spray from a foot or so away so that you don't get too much paint on at once. Many light passes would be better.