Batteries = 2x AA 14500 Li-Ion cells, included.
Current = 114ma if I remember right.
It has a key! yay!
Big chunk of copper for heatsink.
I do not know the power output.
I don't know the power output, and I don't know how much it's worth, it's not the best build ever... But it does work. The driver is the basic LM317T driver, with an 11 ohm fixed resister, if I remember right. Here's an image of it: http://jake.tscsupport.com/images/Laser/Blu-Ray/Driver.JPG
I can't remember what we used to drill that hole, I think it was a pocket knife actually, my drill was missing that day.
This is my friend's laser, I'd never build something like this. If it was me, there would be no project box, only one switch, and the electronics would be glued to the heatsink...
Anyway, he built one of those tiny pocket sized lasers now, so he doesn't want this one.
Again, I don't know what it's worth, just make some offers.
Like I said, I've no idea what something like this is worth. There's probably $25-$30 in parts and batteries there, and I have no idea what a heatsink like that is worth.