This hat looks just like every other premium quality ball cap, with one very important difference: When you need light, just click the switch hidden on the underside of the brim and you have instant Ultra Bright light from the LED"s that are built into and under the brim!! This exclusive 3-way lighting technology lets you select the lighting configuration you need for your specific task; Low Beam Green to protect your night vision while doing tasks in the dark. Low Beam White for up-close tasks like Reading, Hobbies, Home Repair, etc. Power Beam (all 3 White LED"s) when you really want a lot of light for Running, Biking, Walking, Camping, Grilling, etc. 4 CR-2032 Lithium coin cell batteries are concealed in the sweatband, provide up to 75 hours of continuous light and are easily replaceable.