HiLetgo 10pcs 5V 650nm 5mW Red Dot Laser Head Red Laser Diode Laser Tube with Leads Head Outer Diameter 6mm

Bought this to make an automatic laser pointer for my cats. My initial fear of the lights being dim were immediately received when I hooked it up to the Arduino. Great performance. Quality so far seems pretty good, however it seems like the wires are lightly soldered on. So far none of them have broken free. Very tiny, which is great, and probably the best value for the money considering quality and quantity. Love them!

Quality laser diodes. Operates directly from 5 volts... coolly,Expected lower quality, due to the low price, butwas impressed with the quality of the product, andwas further impressed that there was more than oneat this price level.

These are Ok red lasers, but not for mission-critical projects. Some just die without warning, and you will need to replace them. I had a project with 32 lasers, two died before I installed them and 3rd one died later. But they are cheap and when they work - they work.

The media could not be loaded. These diodes at 50 cents a piece are one heck of a bargain. To dispel some of the myths and reviews here is useful information.They only require a 5-volt power supply, that's it. I used an old desktop Christmas tree power/controller to power the diode, it Powers the diode quite nicely at 4.5 volts, and using the controller I get different beam options, (video attached) remember no driver boards or power modules needed, use batteries, 5 volt power supplies, (the diode will work at 3-5 volts although at 3v it's not that bright)THEY ARE FOCUSABLE ! I have seen complaints that they are out of focus, that's because the barrel of the diode is threaded, you can screw the forward portion of the diode barrel in and out to focus it at different distances, it is not one solid piece of brass but split in the middle.This is my second purchase of these, all have worked flawlessly and consistently.One caveat, the wiring is thin, as others have stated, they will break off at the solder joint quite easily. My suggestion cut down some electrical tape and wrap it around the board and wires to act as a strain relief, or, encapsulate the the board and wires with hot glue, this is the best way.Although not tested, my 40 years experience in lasers tells me these are hotter than a typical 5 MW laser diode.

All units work. Ran directly off a 4.5V battery pack. Bright, but has marginal particle flare (expected from low cost optics). Beam spread is about 5/8 inches at 25 feet. I've read this can be adjusted, but the brass/copper head is so tight to the body that I fear I'll damage the unit trying to adjust it. Leads are little short - about 3 inches long, but overall I'm pleased with these units.

A good deal but the beam isn't parallel to the housing meaning they're useless to my application

These LASERS work perfect, are really bright and the cost is outstanding. Super Deal...

This laser diode is perfect for my application which is a laser sight for a Bug-A-Salt unit. However, it pulls 50% more current than the published specifications. The one I tested pulls about 29 mA at 5V instead of 20. I plan to run it from 3 AA batteries in series so I expect it to pull about 25 mA which is fine. The dot size is pretty large but I don't expect miracles for the price, so I'm pretty happy with this product.