Cree XM-L2 LED; Low Mid Highlight mode 3 special modes: Highlight moonlight fast strobe; - Except the highlight mode the rest are memory mode; - Hi: 300lm / 1 hour Mid: 100lm / 6.5 hours; Low: 10lm / 60 hours; Strengthen light: 550lm / 0.5 hours Moonlight: 1lm / 200 hours; Fast strobe mode: 550lm / 2 hours; - Side button and tail button to turn on or turn off the flashlight; - Quick access to special mode: under power off mode long press the side button to moonlight quick press the side button twice to enter strength mode; - 3 normal mode can change by long pressing the side button press twice the side button to enter fast strobe under power off; - Powered by 2 x AA alkaline batteries or Ni-MH batteries or 1 x 14500 lithium battery; - Overheat protection under strengthen mode it will automatically change to 60% brightness in 3 minutes; - Battery reverse protection please don't use the flat battery; - Lock key function: Supports single lock side key or both keys lock