Instructions: To activate the light, you must follow 2 steps: (step 1) Turn the switch to the "ON" position. The switch is inside the seam. (Step 2): Press the ON/OFF button. Warm Tip: Please don't worry about the light and return policy, if your hat doesn't work, you can replace the batteryCOMFORTABLE MATERIAL: The LED Lighted Christmas Knitted Beanie Hat is made of soft acrylic fabric for personality and warmth. One size fits all, boys girls men and womenBEAUTIFUL AND FASHIONABLE: The battery box and switch are hidden in the brim of Santa's hat, the whole hat looks very neat, this beanie is specially designed for you, it is the best gift for festivals, festivals, parties, Christmas, birthdays, neon rainbow party COLORFUL LED HAT: With colorful blinking LEDs, light up your celebration and be the perfect Christmas decoration. Add fun to your vacationUgly Christmas Sweater Style: Pair this jolly accessory with your ugliest Christmas sweater for a holly jolly game-winning look.