Pen Light Features One Watt Lifetime Led Bulb That Never Needs Changing. Bulb Is 12 Times Brighter Than Standard Bulbs. Push Button Tail Switch Offers One-Handed Operation. Secure Clip Holds Fast To Pocket, Briefcase Or Tool Bag. Aluminum Body Minimizes Damage From Dropping And Abuse. Pen Light Offers 6 Lumens And A 100-Hour Runtime And Runs On Two Aaa Batteries.