Involvement:Expert (understands the inner workings) - Ownership:1 day to 1 week
I've been playing around with these for the last couple of days. This is what I found:
* The description (if you can call it that) (3.5V~4.5V 3~5mA) is not entirely correct, especially the part about current. I ran it from 3.3V regulated with 3mA and the beam was barely visible. At 35mA it's comparable to other 5mW pointers I have.
* There's a 270 Ohm resistor on board, so you can wire it directly with a power supply. I used 3.3V, but I think that 3 x 1.5V cells would do just fine.
* The previous review mentioned adjustable beam and a lens.. nothing like that here.
* Also the beam has a visible halo around it. This is not really a problem with diode as a simple lens would fix that.
The bottom line is that it pretty much works as expected. For this price you probably wouldn't find anything better.
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