POWERCAP Solar Powered LED Lighted Hats Combine Solar Power, Patent Pending Ultra Bright LED technology, and premium Microfiber ball caps to provide you with the perfect hands free flashlight. With its rugged, ultra-efficient solar panel, you will never have to worry about buying batteries again. It fully charges in 8 hours of direct sunlight and will provide more than 21 hours of light. The 4 LED's provide 22 Lumens and are concealed under the brim so the hat looks just like any other hat until you need to turn them on. When you do click the easy on/off switch under the brim, you'll notice that 2-3mm wide angle LED's are angled down at 25 degrees to light up where your hands are for close up tasks, while 2-5mm narrow angle LED's are aimed forward to light the distance up to 59 feet away. The rechargeable NiMH battery will last for more than 500 recharge cycles. In case you accidentally leave it on, a built in battery saver feature turns the hat off after 15 minutes of inactivity.