ASP Tungsten 1 LED Lights Tested for durability 4" overall flashlight. Black anodized aircraft aluminum construction. Three high output LED's. O-ring sealed for water resistance. Locking switch. Uses one CR123A Lithium battery, included. Hang packaged. Made using the highest quality materials Cree High Intensity LED Three Position Locking Switch Machined High Strength Aluminum Housing Replaceable Pocket Clip 170 Lumens, 1 hour Runtime