The Night Light Cap has four LED bulbs and a "click" switch built into the bill. One click illuminates the two red lights that are great for nighttime activities and preserve night vision. The second click illuminates the two white lights that work great as a hands free flashlight for finding your way off the water or through the woods. The cap is made of durable, yet lightweight nylon and is vented to help wick away moisture. Replaceable batteries included.