Adjustable and hook and loop fastener : Suitable for adults, boys and girls. One general size fits most. You can adjust the size of the cap by the hook and loop at the back. Material: Cotton. Not included 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.
Package weight: 0.049 kg Product Dimension: 21.00 x 13.00 x 13.00 cm / 8.27 x 5.12 x 5.12 inches Package Dimension: 10.00 x 13.00 x 13.00 cm / 3.94 x 5.12 x 5.12 inches