eGear PICO Zipper Light, Green Super bright mini LED produces 10 Lumens with a 30 foot beam Water-resistant anodized aluminum body with rotary bezel on/off switch 18 hours run time from 4 replaceable LR41 batteries Clips to your zipper, key ring, purse or pack Weighs less than 0.2 oz and is just 1.5 inches long