AAAA Penlight Energizer outdoor pen and cap lights are versatile and lightweight enough to easily fit in vest pockets and backpacks to go wherever needed. Features : Bright white LED with polycarbonate shatterproof lens 360 degree light protection Focusing lens projects concise spot Tool quality composite material construction Momentary switch extends runtime Twist switch for constant light Water resistant Durable non-conductive E-glass case Durable pocket clip Up to 23 hours runtime of maximum light output with Energizer MAX AAAA batteries White LED Max Output: 10 lumens