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By certification 
* 3*Cree XM-L2(U2) LED,2000 lumens output
* Uses 2*26650 batteries
* Aircraft-grade high strength aluminum material
* Over-discharge protection function
* Mechanically tail rotary switch offers high reliability underwater
* Water pressure resistant construction ,depth rated to 150 meters
* High efficiency constant current circuit, constant brightness
* Reverse polarity protection, to protect from improper battery installation
* Alloy aluminum reflector with professional optical analysis
* Premium Type III military hard-anodized seawater-corrosion-resistance finish
* Toughened glass with high water pressure resistance under deep water
* Uses 2*26650 batteries
* Aircraft-grade high strength aluminum material
* Over-discharge protection function
* Mechanically tail rotary switch offers high reliability underwater
* Water pressure resistant construction ,depth rated to 150 meters
* High efficiency constant current circuit, constant brightness
* Reverse polarity protection, to protect from improper battery installation
* Alloy aluminum reflector with professional optical analysis
* Premium Type III military hard-anodized seawater-corrosion-resistance finish
* Toughened glass with high water pressure resistance under deep water