【Replaceable Battery】: New upgraded light up xmas knitted beanie hat: he battery is hidden inside the Xmas beanie cap and runs for 36 hours. The battery(2 * CR2032) can be replaced when xmas hat is out of power. Christmas hats for kids can also continue to shine next year! Merry Christmas! 【Soft and Warm】: Glowing unisex winter 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. 【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. 【Warm Christmas Gifts】: The unisex Christmas party hats are perfect for Christmas Xmas Party Favors. It's warm stocking stuffers Christmas gifts for kids aldults daughter son dad mom boyfriend girlfriend family parents friends. This novelty Christmas hat is nice photo prop. 【Easy to Light】: There is a hidden switch(ON/OFF) inside the seam of the Led Christmas 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.