Features:

• LED: Cree XM-L2 LED with a lifespan of 50,000hours
• Max output 1000lumens (1*18650 or 2*CR123A)
• Output following 5 modes (select modes by twisting light head)

      Mode 1:  Firefly     0.2lms     (1200hours)
      Mode 2:  Low         30lms     (50hours) 
      Mode 3:  Medium  280lms     (5hours)
      Mode 4:  High     1000lms     (1hour&30mins)
      Mode 5:  Strobe   1000lms

With memory function.(You can use the last mode at the next time.)

• Working Voltage : 3.0V-13V
• Max beam distance: 260Meters
• Peak beam intensity: 16800cd (1meter distance)
• Impact resistance:1.2Meters
• Waterproof to IPX-8 standard
• Size: 146.4mm(length)x35mm(head diameter)x25.4mm(tube diameter)
• Weight: 140g(without battery)
• Made of durable aircraft grade aluminum
• Premium Type III hard-anodized anti-abrasive finish
• Toughened ultra-clear glass lens with anti-reflective coating
• Copper base plate for more efficient heat
• Shiny smooth reflector and get perfect beam
• Inside of each box included:

        1x Acebeam T15 Flashlight 
        1x Acebeam nice gift package box
        2x Replacement O-rings
        1x Plastic rubber cap
        1x Removable SS clip
        1x User Manual
        1x Holster
        1x Lanyard
        1x Warranty Card

The above features to the right claim to ANSI/NEMA FL1-2009 Standards. Tests are performed with 1x 18650(3.7V  3100mAh)battery.