Amazon.com: 2 Pack Christmas LED Light-up Knitted Beanie Hat 。One button easily turns the hat on & off, as well as controls 3 flashing modes which range from flashing to all on. 3 mode: mode #1: Speedy strobe, all lights simultaneously flash furiously fast in this high energy mode. Mode #2: Slow strobe, all lights flash slowly in this high energy mode. Mode #3: Shine on, all Led bulb colors remain on glowing brightly together. Pair this merry accessory with your ugliest Christmas sweater for a holly jolly contest-winning look. This Led Santa hat will give you a fun photo booth prop. Perfect for Christmas Xmas Party Favors, Ugly Sweater Party, Halloween Party Favors, Holiday Family Celebration Party, Christmas Dress-up Accessories, Christmas Light-up Toys, Christmas Holiday Decorations, even a fun novelty gag gift and a great additional intersperse to all occasions. Batteries are included, Can not Replaceable. Normally, the batteries can use more than 36 hours.