LED Hat, Ultra Bright LED Light Up Battery Powered Unisex Baseball Cap Easily to Adjust Fits Man Women, 3 Modes Glowing Hat Perfect for Party Hip-Hop Running Hunting Jogging and More Adjustable: Suitable for adults, boys and girls. One general size fits most. You can adjust the size of the cap by the velcro at the back. Material: Cotton. CR2016 lithium battery continuous work up to 72 hours (battery is replaceable). You could purchase the battery on watches shop, electronic mall, supermarkets. Easy to use: "on/off" switch is concealed in the brim. There is a small dot sticker to notify you where the switch is. Four mode can be choosen: on, slow flashing, fast flashing, off. Improve security: Best enjoyed and viewed in a low light or dark environment and can be avoided some potential traffic dangers. Widely used: Make you look cool in dance fitness event, night club, disco, KTV, bar, banquet, party, floor show, stage show, evening show, performance show, vocal concert, and some other special events. One size fits most-suitable for adults, boys and girls.With free size, adjust the control Use 2 CR2032 batteries(include) or USB rechargeable battery (rechargeable version ) contribute to long service time Easy to use: &#034;on/off&#034; switch is concealed in the brim. There is a small dot sticker to notify you when the switch is. Four mode can be chosen: on, slow flashing, fast flashing, off. Colors: Red, Green, Blue,white What&#039;s more, it&#039;s also a great gift for son, daughter, father, mother, grandfather, grandmother, and other one you loved. <span class="a-text-bold">High quality material</span>: Cotton, made of a material that allows the scalp to breathe. <span class="a-text-bold">Adjustable</span>: The adjuster at the back is Adjustable nylon buckle which makes it  fully adjustable, will fit many different head sizes. Size about  18x13x14cm <span class="a-text-bold">Comfortable</span>: You can&#039;t feel the switch when you&#039;re wearing the hat. The button is housed in a small elastic pocket within the cap <span class="a-text-bold">Practical</span>: It can be used as an ordinary hat during the day and play its luminous function at night <span class="a-text-bold">Three flash mode</span>:  on, fast flash, slow flash. (Pressed the on/off button once turns it on  flashing quickly, twice makes it flash slowly and three times makes it a  continuous steady light. Four times makes it off.) Best enjoyed and viewed in a low light or dark environment and can be avoided some potential traffic dangers Perfect for Concerts, Rave Festivals, Bars,Clubs, Electric glow run, LED parties, Running,Camping ,Halloween, Costume Parties, Mardi  Gras, Carnivals, Gifts, and more