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Adjustable and Velcro fastener : 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.