Panther Vision SCUB-3990 4 LED Solar Powered Microfiber Hat, Olive 100% Polyester Microfiber Imported The rechargeable NiMH battery will last for more than 500 recharge cycles The patented 3 way switch lets you pick each lighting option separately or have both on at the same time for maximum light In case you accidentally leave it on, a built in battery saver feature turns the hat off after 15 minutes of inactivity