Unfortunately, this specific lens has manufacturing defects. The only positive aspect is its size, but that is its only advantage. I have bought three so far and all three broke suddenly without much use. The warranty is useless as they do not repair or replace them, despite claiming to have a warranty. This particular lens will last at best for a year. It is definitely not worth the money in any case

Easy to use, lightweight, with powerful light, good beam spread for an EDC flashlight, durable, with light dimmer, instant on-off, waterproof, rechargeable with good battery life, convenient shape and size, and good materials. It has 10 fewer lumens but a better beam spread than the upgraded tube Version 2 with 55lm. I had 2-3 and donated many tube 45 flashlights here for years with a lot of mishandling. The 45lm flashlights have better build quality except for the problem in some where the cable gets cut from the battery. It can be easily fixed with a soldering iron. Similarly, the versions with 55lm have more problems that essentially cannot be solved.

A very useful gadget, lightweight, rechargeable, and you can attach it to your keychain. It has a strong UV beam.

I used it a couple of times, without any mishandling, stored in a drawer, wanted to use it after a month and even though it seems to charge normally, it doesn't turn on!
Purchased in a flash sale on gb for 5.5€. So it's not worth even that in the end...
Equivalent rechargeable flashlight from gb for 2.5€ purchased together with the tube, works flawlessly.
It's up to you!!!...

One of the battery contacts broke in the first few days. It was repaired with a soldering iron and it's working fine now. Very useful.

I have been using the lens for about two months in the evenings during delivery, in rain and cold weather, and it doesn't falter at all. It has a very strong beam of light and is user-friendly. I will definitely buy it again. One great advantage is that the recharge lasts quite a long time.
Update: Suddenly, it stopped turning on, but it charges normally. It seems that the battery contacts are not functioning properly. I will probably buy a new one.

I bought the version with the red LED for astronomical use. Everything was perfect until the third charge. From then on, it never worked again. For the name that Nitecore has, I did not expect something like this. So I'm going back to the Chinese one on eBay for 2 euros with the single AA battery, which has been doing its job with dignity for years.

Necessary tool. Expensive in Greece. On 17/5/20, I bought two tubes as a gift with the new colors released by Nitecore, and both stopped working after months. Both made a sound like something moving inside, and eventually, their battery plays inside and the cables detach from the circuit board.

Excellent product at a very low price (5 euros from abroad), I found them on sale and bought 4! Strong light, nice quality construction, maybe one downside is that it's difficult to open the protective rubber to charge it, but on the other hand, it's good to prevent moisture, etc. You can charge it anywhere with a mobile phone micro USB charger. It's also good that it has a low setting at the beginning, which is convenient in the dark. Out of the colors I got, the strongest and whitest is the transparent one, I don't know why, maybe it just happened. Overall, it has 10 colors and you can choose whichever you like from such a wide range of colors. Highly recommended!

Update: After 7 months of use, two of them stopped working almost at the same time. I opened them and saw that the red wire from the battery was detached, I reattached it and now it's fine. Maybe it was a faulty batch of lenses or maybe it's a general issue.

Very good and practical flashlight.
Initially, I bought one for my military service, it served me well and even more. Then, by mistake, I put it in the washing machine and it survived, and after 2 years of trying, it still works!
+ Lightweight
+ Small
+ Rechargeable
+ Resistant to falls/water
It's worth its money, even though here it has a higher price. I bought another one from abroad with a much lower price.

It has become my favorite gadget.
Hanging on my keys, it has helped me many times.
POSITIVES
• Small size
• Lightweight
• Rechargeable with a mobile charger
• Waterproof in water splashes
• Resistant to falls
• It emits a full light of 45 lumens. It is quite powerful, like two mobile phone flashes combined.
• It lasts for 1 hour in 45 lumens mode.
• In low consumption mode, it emits 1 lumen, which is equivalent to the light produced by a lighter in the dark. And it lasts for 45 hours in this mode.
In other words, 45 lumens for 1 hour
1 lumen for 45 hours.
• It includes some very durable key rings.
NEGATIVES: None.
NOTES:
Anyone who wants something very powerful should consider the Nitecore Tip. It is the same size but has 360 lumens, which means it is almost ten times more powerful.

Quality keychain flashlight with a long-lasting rechargeable battery. Lightweight and partially waterproof. 45 lumens brightness, perfect for always having a flashlight with you for when you need it. Charges with a mini USB cable on the computer or with a mobile charger with a mini USB.

A very practical and lightweight keychain flashlight. A small (but powerful enough) flashlight can always be useful, hanging on the keys... But it does the same (almost) job as similar keychain flashlights that can be found for 3-5 euros, with the main, but VERY IMPORTANT difference, the ability to charge it with a micro USB cable (just like a smartphone charges).
Also, the ring it has for hanging the keys is unacceptably small and will not fit more than two or three keys....
UPDATE: 03/09/2018. Today, almost two and a half years after its purchase and while it has been working perfectly until now, it suddenly "died"!!! Until now, it worked perfectly, without any decrease in performance, neither in brightness nor in battery life, even though I had it constantly hanging on my car key and used it very often (almost daily).
I consider that it was worth the money, and more.