I just bought a 405nm 5mW (blue/violet) laser pointer. It did not come with any batteries, which is fine. It requires 2 AAA batteries, of which I have plenty. The seller shipped no paperwork with it. I don't want to make the assumption (because "when you assume, you make an A out of U and ME), since I may damage the pointer if I guess wrong. Its eBay number 280445522110. It seems to be a common model. If anyone owns one, I'd like to know the proper battery polarity. Positive (+) pointing forward, or Negative (-) pointing forward ? Forward being the business end where the light comes out. PLEASE DON"T GUESS. Only respond as if your live depended on it. Does anyone believe in documentation anymore ?! If only to avoid returns, if it gets damaged, by inserting the batteries in wrong.