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Is this a power switch of twist type?
And What are the benefits of Brass FlashLight?
Is This better good than Titanum or Alu or Cu?
Yes this uses an electronic on/off switch . The rechargeable battery in the switch is charged by the aaa battery. In my opinion brass is better than the aluminum or titanium at dissipating heat but not much of an issue in this light. Mainly it looks classy. And this is a great price for this light.
It's not a twisty.
Brass is an alloy that contains copper. Brass is harder than copper and retains some of the properties of copper. Such as antimicrobial and it will patina. As you can see in the description.
Cu has the best thermal and electrical conductivity but it's the softest and heaviest material. Alu comes in second in thermal and electrical conductivity and it's lightest material. It's harder than Cu and Brass.
Titanium grade 5 is the strongest material of all. The best in corrosion and impact resistant. It less likely to chip or dent if you drop it but it scratches somewhat easily. It's second lightest material to Alu. It has the worst thermal and electrical conductivity. It's not a very good material for threads. Titanium is a "galling" material, which means it is very intolerant of friction.
Brass thermal and electrical conductivity is better than titanium but worst than Alu and Cu. It weighs similar to Cu. Corrosion resistant is better than Cu. It's a soft material like Cu but harder.