The $7 price includes shipping!
I have one similar (not SingFire though) and:
- Modes / UI is Hi(1.5A)->Low(0.3A)->Strobe->Off.
- There is visible PWM on low
- The reflector is LOP, but still too throwy for a headlamp (for my taste) -> DC Fix helps
- Powered by 1 or 2 x 18650 (parallel)
Considering all what was said above, I already ordered six of those..
