DarkEnergy, the SOG line of flashlights, pierces the night. They look different and they behave differently. These are the brightest flashlights of their size. You will be surprised at the power when you switch on the DarkEnergy lights. Light up the tree tops to appreciate the penetration and range. DarkEnergy has the best switch in the business, a full on/full off switch (each and every time) that also half-taps to 40-percent output, reading mode, and then tactical strobe. The 6061 T6 aluminum housings are aggressively checkered.more than any other, and are coated in a Class III anodizing for maximum durability. Count on DarkEnergy when light is not enough but when blindingly bright is. DE-03: Max output of 120 lumens and a run time of 75 minutes on 100-percent brightness, or 5.7 hours on reading mode. Includes (1) AA Battery. Overall length: 4.5-inches, Weight: 3.8-ounces DE-04: Max output of 200 lumens and a run time of 32 minutes on 100-percent brightness, or 8.3 hours on reading mode. Includes (2) AA Batteries. Overall length: 6.45-inches, Weight: 5.6-ounces DE-05: Max output of 550 lumens and a run time of 77 minutes on 100-percent brightness, or 24.3 hours on reading mode. Includes (2) CR123A Batteries. Overall length: 5.5-inches, Weight: 5.4-ounces. Features a Cool White Cree R5 LED bulb with a Optical Grade Polycarbonate Lens and Textured aluminum reflector Four operation modes - Momentary on, Full on (100-percent brightness), Low (40-percent brightness), Reading (25 lumens), and Strobe IPX-7 Protected against water immersion. (Immersion time 30 minutes at a depth of 1 meter) Batteries: (2) CR123A (included) Brand: SOG Model: DE-03 / DE-04 / DE-05 Materials: 6061T6 Aluminum/Optical Grade Polycarbonate Color: Black Dimensions: 4.5X1.2X1.2 / 6.45X1.2X1.2 / 5.51X1.3X1.3 Weight: 3.84 oz - 5.44 ounces Color: Black.