The Trailfinder Camo Top Lite fit's on top of the cap bill and weighs 3/4 of an ounce. The first light to shine when you push the button is the green middle light. Deer, Turkey and most animals are not able to detect the green light but it is very bright for you to see your trail to your deer stand. On the second push of the button the green light goes off and there are two bright white lights that come on. This light operates on two CR2032 batteries which are included.