... .7. Invironmental protection : With rechargetable lithium battery , and it can protect environment .8. Hardness : Careful manufactured by avation aluminum , anodic oxidation surface ... to tactics , self-defense , seargh , outdoor light and various special environment .Main Performance Parameters :SizeLengthMM170Head diameterMM35Tail diameterMM26.5Battery18650 Li chargeableMAH4400high power ...