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Quick Question. In your opinion. This lens seems to focus "out" to the point of making the dot about 2 feet wide or more from maybe 10 ft from a wall. Is that relatively safe to look at more extensively then a focused beam? Just curious, it's almost more like a blacklight bulb when so out of focus.

Yeah it make no sense, especially since the batteries have almost no contact surface on the "button" side. Why would you use that side for the spring instead of a flat surface. The host has a key in that end cap and the cap inside has a contact plate that is perfect for the flat side...who...

It ended up being that the positive side of the battery for 18650 touches the spring...it worked... This is against every electronic device I've ever used and doesn't really make sense...the spring is always for the flat side of battery/negative....but in this pointer it only works with opposite.

Sorry bad english! I meant I only tried it the instructed way at first, both new batteries. I tried once the opposite way quickly but did not want to fool around with it and make it worse. Since I returned them immediately I can't try more. I should receive the 18650's today in the mail. I...

405nm I only tried negative side up towards the diode same as instruction stated. Although if it's designed for 3.7 then maybe just too low voltage? I returned the cr123... Only tried it in the store

Hi, I didn't double up. I took the spacer out to see if o could get a power up from one 3v cr123. Put negative side facing up to contact the spring coming from the diode, positive side down.

I realize it's cheap crap, but I wonder if 3v is too low to even power on versus the "normal" 3.7v? The cr123 I could find is only 3... Just curious! Got a surprisingly speedy delivery of a 301 Laser model from Ebay. Did not come with 18650 battery, which I realized and then purchased 2 day...

Hi! This is the run of the mill ebay 405nm AAA powered "Chinese" unit I took the module and board out to check, everything looks fine, lens has no smudges. After first 3 days of use I left it alone in working order. Then I come back and it the dot is quite dim, not a focused beam like before...