Not sure of the origins of this light, acquired in the purchase of a gun show retailer. 

Here's what the manual states:

500 Lumen

Mil-Spec Type III hard anodized finish

Aluminum alloy

IPX8 Waterproof

Precision aluminum reflector

5 function: High, Medium, Low, SOS, Strobe

Tail Standing

Anti reverse protection (battery)

CREE XML T6

Requires 2x18650 batteries (not included)