The beam really is very bright. Although I don't own an optical power measurement device, I'd say that it's putting out quite a bit more than the promised 5mW. As others have said, the wires are soldered quite badly onto the PCB and they let go quickly. The button is rather inconvenient too. But... The beam really is very bright. Although I don't own an optical power measurement device, I'd say that it's putting out quite a bit more than the promised 5mW. As others have said, the wires are soldered quite badly onto the PCB and they let go quickly. The button is rather inconvenient too. But since bare laser modules are meant for people with at least basic electronics and soldering skills, I don't think that will be a problem for anyone. These modules draw about 220mA from two fresh alkaline AA batteries in series. It's safe to assume they'll draw a bit more from a stabilised 3V voltage source, but I didn't try yet. Device offers great value for money. Read more

- Price - Power output - Construction - Driver circuit This laser module is cheap, in my country it's about 1/6 of common price. Power output is very good, beam can be easily seen in the city at night, very bright dot at day, even under quite strong sunshine. Did not measure the real output yet.... - Price - Power output - Construction - Driver circuit This laser module is cheap, in my country it's about 1/6 of common price. Power output is very good, beam can be easily seen in the city at night, very bright dot at day, even under quite strong sunshine. Did not measure the real output yet. Construction looks robust, but something rumbles inside - probably crystal piece (does not affect anything). Another "pro" is driver circuit, so you can just easily put it on 3V, and you're ready to go. - Absence of IR filter Actually is not that bad. I looked at the beam though my CCD "nightvision" (simply CCD chip with viewfinder from old camcorder in one line -_- ) with visible light filter applied in front of the laser, so only IR went thru. IR radiation looked to be quite small. - Very usefull stuff for many projects - best use in laser pointer. Read more

Well, it's green, is quite bright, focusable, and arrived in one piece -- a good start by all accounts. 250mA appears to be the correct draw for this item (see further comment in 'Cons' section however). I have an issue with the description of ALL the green laser modules, though this one to be on... Well, it's green, is quite bright, focusable, and arrived in one piece -- a good start by all accounts. 250mA appears to be the correct draw for this item (see further comment in 'Cons' section however). I have an issue with the description of ALL the green laser modules, though this one 'appears' to be on the money. If you look at the description to the other comparable modules such as SKU: 26891, you'll see that they all state 250mA as their current draw. I find this value hard to believe. Let me explain: How can a 200mW laser draw the same current as a module 40 times smaller?! In short, it can't. And I HIGHLY doubt they simply took the same PCB layout and swapped the resistors to suit the diode. If they did, the run time for all module powers would be the same as the most powerful one in this range. We know that not to be the case as the low powered modules, such as this one run for considerably longer. Moreover it's annoying because it means that in terms of telling whether it will fit your project, or indeed deciding what other components you're likely to need/order to accommodate it, you're none the wiser. All the pictures showing this range of modules are actually stock, in so much as they are the same module. Look at the resistor band colours. In short, I can't afford the time or money to have an item turn up only to find it's specification deviates 3 or 4 fold from what it was listed as. I realise this is just a little laser module off a Chinese site, and that I may have come across a bit OTT for something that is trivial. However DX might do well to remember that correct specs mean enthusiasts can make better, more informed decisions leading ultimately to a purchase. My point; as it stands, I'm going to have to look else where to find a site that can assure me and give me what I want. Read more

nice green laser , you can see it at night quite a nice price. but is is chinese quality so its a good idea to buy more than one! leads tend to drop of , so you need some soldering skills to make them work. i also thought that the button on the laser was a bit annoing. also its a bit of a shame a... nice green laser , you can see it at night quite a nice price. but is is chinese quality so its a good idea to buy more than one! leads tend to drop of , so you need some soldering skills to make them work. i also thought that the button on the laser was a bit annoing. also its a bit of a shame that its a 3 volt laser , it would have been nicer if it had been a 5 volt laser like the new wish , but the new wish broke quickly after overvoltage. Always be carfull , you should know what you are doing. and i thought it was handy to bypass the switch and put the laser on a pice of wood. that way you got a solid laser good quality price ratio Read more

Very nice laser module! I am use on I=350ma output power less 50 mw bright, low price Great module. Fairly well built. It's nice to have the option to put an on-board control on it, but a button makes it more of a "pointer." Great for DIY applications. If you can't even solder, this a A... Very nice laser module! I am use on I=350ma output power less 50 mw bright, low price Great module. Fairly well built. It's nice to have the option to put an on-board control on it, but a button makes it more of a "pointer." Great for DIY applications. If you can't even solder, this just needs a power source. A square or box design would be nice, but overall a decent build with quite a few applications. I really hope to see other frequencies offered soon. Combined with a similar power red and blue, blue/violet you could make a nice "laser show" unit. Read more

Very powerful, considering the 5mW rating. Able to faintly make out the beam in a lighted room. The dot is clearly visible on the hillside out my window ~0.5 mile away in the late afternoon/evening. Very poor soldering. The wires aren't actually soldered on, they are basically glued to the The on... Very powerful, considering the 5mW rating. Able to faintly make out the beam in a lighted room. The dot is clearly visible on the hillside out my window ~0.5 mile away in the late afternoon/evening. Very poor soldering. The wires aren't actually soldered on, they are basically glued to the module. The red wire on mine was completely detached and I had to figure out where it went in order to reattach it. The switch is a momentary switch that you have to hold down. I wish this weren't the case because it makes DIY projects very inconvenient. If you put it inside any kind of case, the switch is inaccessible. I rewired mine to bypass the switch so I could use a switch mounted to the outside of my case. The on-chip pot allows you to dial up the power a bit as well which is nice. It's a great buy for a DIY project, and a great price, it just takes a bit of work. Read more

Seems well built, and very bright for is stated 5mw output, which suggests it may be doing even more. - Small, and I mean quite small. it is a lot smaller than I had expected it to be. - No power fluctuations. - Adjustable focus. - Reasonable price. Could be a little cheaper. - Was backordered to... Seems well built, and very bright for is stated 5mw output, which suggests it may be doing even more. - Small, and I mean quite small. it is a lot smaller than I had expected it to be. - No power fluctuations. - Adjustable focus. - Reasonable price. Could be a little cheaper. - Was backordered for quite some time. - Easy to kill the diode if you barely go over 5V input Would be nice if it still worked thru the spring terminal on the back. - Maybe also with the switch still included, but not a big worry as they are easy enough to find and solder in if needed. Great module, producing more power than it's rated for, and for a reasonable price. Good for little projects that require a small, bright laser Read more

The price and brightness. I use these for building laser vortex's for halloween and these blow away the ones I used last year be gentle handling these...build is not as sturdy as the ones I used last year but could not pass up the price. need to figure out how to replace the on/off button to be 3... The price and brightness. I use these for building laser vortex's for halloween and these blow away the ones I used last year be gentle handling these...build is not as sturdy as the ones I used last year but could not pass up the price. need to figure out how to replace the on/off button to be always on... ordered 3 to test and 1 was bad so seeing how well replacement policy is. if good, will be ordering more of these. Working on new design for vortexs so once it's set in concrete you'll see another order or so Read more

This laser is brighter than my 10mw green laser from a different supplier it works well with 2 rechargeable AA batteries. I could add a different switch easily without taking off the one it has. It is so cheap you can afford it easily and if you kill it not a huge loss at the price. The circuit a... This laser is brighter than my 10mw green laser from a different supplier it works well with 2 rechargeable AA batteries. I could add a different switch easily without taking off the one it has. It is so cheap you can afford it easily and if you kill it not a huge loss at the price. The circuit board is held in place only by the leads from the laser diode and not attached to the housing at all. Not focusable. It only works when it is warm above 15 degrees Celsius. Below that it drops to about 5% of it's starting brightness in less than a second. It gets warm after about 10 minutes use not hot. The mono-potassium phosphate doubling crystal is tiny less than 1mm on a side. The focus is set so you see the same size dot at any distance. I wouldn't use over 2.5v as it is ample. Unless you want to burn things or blind yourself this is great and at the price you cant go far wrong. Get one even if you don't need it you will find a use. Read more