1.The body of lights are made from aerospace-grade aluminum by CNC programmed machine with Milspec anodized finished ,highly durable.. 2.The flashlight can resist water as the rubber O-rings are installed. 3.Imported brand LEDs , it is long span-life(over 100000 hours, which means you can continuous use it for over 10 years!); 4.The ideal driver circuit worked safely by control . 5.Toughened ultra clear glass Lens with AR coating. 6.Push-button tail cap switch Using P4(T/U) bin LED or Luxeon LED or Cree LED and ect (option) Maximum brightness : 240 Lumens or 130 lumens or 120 lumens or 80 lumens (option) Battery: 2 x CR123A and 2 x 16340 or 1 x 17670 recharge lithium (option)