【Replaceable Battery】: Light Up Xmas hat upgrade: When the Christmas hat's built-in battery runs out, you can replace it with a new button battery. Christmas hats for kids can also continue to shine next year! HAPPY CHRISTMAS! 【One Size Fits All】: Each light up Christmas knitted hat size is 22x26cm / 8.7x10.2in. Unisex led winter beanie sweater cap fit for kids, adults, men and women. Christmas LED knitted cap has good elasticity, it will be fitting closely, won't make you feel too tight or loose. 【Soft and Warm】: Glowing christmas hat is made of double-layer elastic and soft acrylic fiber, comfortable to wear. Glow in the dark Christmas knitted cap can cover the ears keep your head warm and cozy in cold weather, fit for wearing at indoor and outdoor. 【Easy to Light】: There is a hidden switch(ON/OFF) inside the seam of the Led Christmas beanie hat, just press the switch 'ON' and the light will flash. LED christmas party hats with 6 built-in LED lights, and the light has 3 colors of red, blue and green. 【Warm Christmas Gifts】: The light up Christmas cap is printed with a lovely elk Christmas elements. It's warm stocking stuffers Christmas gifts for kids daughter son dad mom boyfriend girlfriend family parents friends. They will love this light up santa hat!