Laser Module Violet Purple Diode 405nm (Industrial DOT Laser)405nm DC3-5V

Good quality. The dot laser is connected to my Lift Master garage door opener projecting onto my dash for parking distance.

It works great it's visible in air at night,it doesn't need a lot of power to work, but the weird part is that when you use something like 5v It looks dimmer so I'm using 3v.

At five volts, this thing projects a discernible dot about 1 1/2 feet in a normally lit room. I need something to throw a bright dot about 20 feet. Junk in my book and it’s going back.

I bought 3 of these in the same cart, because I needed blue lasers for my project. They sent me two of the pictured item, and one of much smaller form factor(like the width of a pencil eraser), and it wasn't even blue. It was red. Blue lasers don't seem to be prevelant and cheap at the same time, so I had to intiate an exchange, which with Amazon's structure, is making me now send back the item, kinda wasting my time, and inconveniencing me. Rather annoying, but so far they seem like they'll do the job for me. The lens does allow focusing, but I haven't tested the distance range with a fine dot yet.

using for a laser spirograph project - it looks good and works for what i wanted but specs say Working Votlage:DC3-4.2V - really don't get much brightness out of it until around 6-6.5v

Diode worked great, produced strong color and was easy to work with.

I only hooked it up to 3.3v battery. It was very satisfying. I'm happy with my purchase

Works as expected