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Adjustable: Suitable for adults, boys and girls. One general size fits all. You can adjust the size of the cap at the back. Material: Cotton. The lithium battery can be replaced (including 2 batteries) (USB charging time is only 30 minutes, it can work 2-4 hours). 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. 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. Improve security: Best enjoyed and viewed in a low light or dark environment and can be avoided some potential traffic dangers.