Acrylic knit beanie with integrated LED light panel made of ABS and TPR. Uses 2 button cell batteries (CR2032), included, replaceable. Features 4 bright white LED lights with 3 levels of brightness: 100%, 75%, and 50%. (From "off" setting, press black button once to achieve 100% brightness, a 2nd time for 75%, a 3rd time for 50% and a 4th time to turn off.). LED light: 120 lumens. Hand-wash only. Remove light panel prior to washing.