Powered by Cree Q3 LED;Lamp Life:50,000 hoursLight Output:180Lumens Power Source:1-cell 16340(CR123)BatteryInput Voltage:3.7V—4.2VAerospace-grade aluminum body with anti-scratching typeIII hard anodizationConstruction:Shockroof and water resistantSwitch:end-cap on/off modeToughened Clear glass LensDimensions: 7.5cm(L)X2.1cm(D)Weight:27g(excluding battery)we also accept sample order