... fiber optic hat 2. lighting and flashing your logo Fiber optic LED flashing hat 1.Material : 100%cotton 7444 ... :60-80 hours ,normally can be used for 2-3 months;The battery can be changed ... orange,yellow,green,blue.9.Battery powered,convenient for replaced.10.Instructions:push the button,the frist ... orange,yellow,green,blue.9.Battery powered,convenient for replaced.10.Instructions:push the button,the ...