It requires one 9 volt battery (not included) One size fits all. There are a couple very slight marks on the back of the hat. Stenerud was inducted into the Pro Football Hall of Fame in 1991 and Mr. Bell was inducted in 1983.Smoke free and pet free environment. This would be a unique and great addition to any collection! Listing and template services provided by inkFrog. This item is in the category "Sports Mem, Cards & Fan Shop\Autographs-Original\Football-NFL\Hats". The seller is "icemanentertainment" and is located in this country: US. This item can be shipped worldwide.