From Brookstone, this beanie features: Easy, one-button controls LED lights Front (4) white LED, 3 lighting modes Back (4) red LED, 2 lighting modes Compact size and lightweight Arrives ready to go, just switch it on and put away your flashlight Long-lasting LEDs.  Includes (4) CR2032 (3-volt) button-cell batteries One size fits all, this knitted hat with a built-in and removable LED light can illuminate up to 30 feet away Imported.