Penlights feature 100,000-hour LEDs and come standard with powerful Momentary-Blink/Constant-On switches. Plus their knurled, anodized aluminum bodies ensure rugged corrosion-resistant operation. There's even pocket clips to help keep them close, and they're IPX4 rated for water resistance to 2 m. Uses three AAA alkaline batteries (included). 6 3/16 x 3/8". Blister packs.