I was provided a copy for review by Zanflare.


Waterproof, Impact Resistant, Anti-corrosion, Abrasion Resistant
Machined from a solid aluminum bar give F2 its superior shock and impact resistance; All metal outer appearance and metal nut provide IPX-8 highest grade waterproof and weather two meters submersible adventure.
High Technology-Made Surface
"Crystal Coating Technology" combines "precision digital optics" to provide extremely high reflector performance; Toughened ultra transparent mineral glass and anti - reflective coating; Light weight, high strength aviation grade aluminum alloy, HA11l military grade hard anodized.
Smart Indicator
when you turn on the flashlight, if the battery power is higher than 30%, the blue light will blink for 5 seconds, if between 30% and 10% a red light will blink for 5 seconds, when the power is less than 10%, the red light will flash.
Low Battery Warning
-When the battery is less than 10%, a red light will start flashing in order to warn the user to change the battery and avoid any possible damage.
-If the user continues to use it without replacing the battery, the flashlight may flash abnormally and the user may fail to access to other modes.
-The flashlight will turn off automatically only when the battery is completely discharged.
Package
1 x Flashlight (2 AA batteries are not included)
1 x Lanyard
1 x Clip
2 x O-ring
Instructions
1. Press the tail switch to turn the flashlight on / off ;
2. Once turned on, gently press the tail switch to switch between the four different modes: low - medium - high- strobe.









- To turn the light ON, press tail switch.
- To advance modes, half-press tail switch (Low -> Med -> High -> Strobe)
- To turn the light OFF, press tail switch.
Comments: I dislike the "forced" strobe and wish that there was a way to turn it off.
Output, Runtime and Power

Measurements were done using a freshly charged 2450mAh NiMH.
Regulation

Starting from High, this light will hold an output of over 200 lumens for about 150 minutes. In my case, right at about the 150 minute mark, the output dropped from 200 to 100 lumens over the course of ~2 minutes. After that, it immediately dropped down to just 2 lumens. I call this a "vampire mode". It will run at 2 lumens indefinitely until the batteries are completely drained.









This size light is a "long tube" 2xAA design. It is thin enough to fit in a pocket but only if the pocket is deep enough (or you are okay with it sticking out a bit). The finish looks excellent, is clean and my copy had no defects.
The beam profile is very balanced and is well-suited for general usage. My copy was a very pleasant 4700K color temperature (warm neutral). I like the trend of manufacturers offering "neutral white" lights in this color temperature range.