One of the brightest and most compact lights available.  The Fenix E15 features include:

• Cree XP-E LED with a lifespan of 50,000 hours
• Uses one 3V CR123A Lithium battery Included
• 2.3" (Length) x .8" (Diameter)
• .8 oz weight (excluding battery)
• Digitally regulated output - maintains constant brightness
• Reverse polarity protection, to protect from improper battery installation
• Reliable twisty switch
• Capable of standing up securely on a flat surface to serve as a candle
• Made of durable aircraft-grade aluminum
• Premium Type III hard-anodized anti-abrasive finish
• High-efficiency total reflection lens

Notice: The above-mentioned parameters (tested with high-quality CR123A Lithium battery in Lab) are approximate and may vary between flashlights, batteries and environments.