Description: Specification MaterialAluminum AlloyLEDLUMINUS SFT40Low voltage warningYesReverse polarity protectionYesLens typeAr coated glass lensReflectorSmoothMode memoryYesTailstand YesRequired battery type21700 lithium battery not included Required battery quantity1pcsFluxMax 2000LMTc6500KIlluminanceMax 395KCDRangeMax 1258 metersDriver12groups max current output 8000mA Temperature protection management insideLength Head diameter Body diameter170 5mm 62 6mm 26 1mmNet weight212gGross weight247g12 Groups 1 click the switch to turn the flashlight on off tap the switch to select mode2 if flashlight is turned on tap the switch 20 times quickly to enter into config mode On a visual interface as long as you click on an option it means that the option is selected The flashlight has no visual interface It flashes to represent an option and tap the switch in the flashing process means to select the option Option 1 normal flash 1 time buzz flash tap the switch to enter into sub option to select the mode group If the user has no operation the config mode will enter option 2 sub option 1 1 normal flash 1 time tap the switch to select mode group 1 0 1 1 10 35 100 strobe biking battery check sub option 1 2 normal flash 2 times tap the switch to select mode group 2 0 1 1 10 35 100 sub option 1 3 normal flash 3 times tap the switch to select mode group 3 100 35 10 1 0 1