LRI AUV Photon LED Keychain Micro-Light, Ultraviolet Beam

LRI AW Photon LED Keychain Micro-Light, White BeamThis is the screwless back, push AND hold version. The one with the screws on the back has a slide switch on the front for locking the beam on. This one turns itself off the second you stop squeezing. LRI also makes an electronic switching version without a mechanical slide switch which will lock on by squeezing alone and includes brightness levels and a flashing mode.The cheapest is this push and hold version.Impressive light output and battery life. I used the slider version to hike out of Half Dome in Yosemite (from top to the Valley) in darkness the from Nevada Fall down to the Valley (NOT along the MIst Trail!). It provided plenty of light and the mechanical slider meant my thumb and finger didn't collapse from constant squeezing.This cheaper squeeze-only version has one outstanding feature besides much lower cost. It is really, really hard to kill the battery accidentally from accidental squeezing in the pocket, from coins, pocket knife, money clip etc., since even if some random pressure activates it, the moment the pressure is released the light turns back off - and constant accidental pressure is unlikely as stuff generally shifts around.Also, it is really really foolproof, I've had some problems with the slider edition.So - the electronically switching version can be turned on accidentally and drain itself. And the slider version is much more expensive, trickier to reassemble after battery change, and generally finicky.That leaves this as the king of emergency key chain lights that won't self-destruct.There's only one small, incredibly minor problem. It takes the harder to find 2016 batteries instead of the easier to find and often cheaper 2032 batteries. It needs dual 2016 batteries. Two 2016 batteries are as thick as one 2032 battery. The cheapest, easiest source of 2016's is Amazon Basics.Tip - if you DO use the 2032 battery, in this, in spare one or older one - you suddenly have a half-as-bright version which is neat for inflight use, where you don't wan't to wake up the whole cabin when you are trying to use the flashlight to find something. I often carry two together, the bright squeeze one with double 2016's and an older slider model with as single 2032 for reading.

Photon Microlights are perfect for small illumination applications such as finding keyholes and camp chores. What’s more they can help keep you alive when things go sideways in the dark. Durable, waterproof, compact and ultralight, they live on my car keyrings and backpacking lanyards. Nothing is more miserable…and potentially more dangerous … than having to operate in the dark…whether getting back to camp after answering the call of nature in on a moonless, stormy night or finding things you need after a late-night car wreck. My microlights are always handy and always work. I consider them to be first-line survival tools as well as super convenient.

Given as a gift for the kids

I would have preferred a constant on switch. Don't like having to continually press the button to illuminate.

I've unfortunately bought several other brands and types of this relatively simple device. And I've paid WAY too much for some of them that broke easily or had other significant problems.This gem works exactly like it promises. Its design is simple and durable, avoiding some of the delicate parts that other LED keychain lights sometimes use. These other lights might look "cooler", but I've found they are prone to breaking (see my other review, Microbeam Flashlight, if you're curious).Most importantly (at least to me), it only lights when I want it to! This may sound like a silly thing to get excited about, but I've found other brands commonly go off in my pocket unintentionally. And some other brands of LEDs have a "leave it on" position. Leaving this small convenience light on when not pushing the button isn't necessary for me. And I've found it just increases the chances of accidentally turning it on in my pocket, only to find that the battery goes dead far before it should.If you only buy one LED keychain light this year, I highly recommend this one. And I've found it makes a simple, useful, and reasonably priced gift also.

A note to potential buyers: there are two different versions of this on Amazon (and anywhere really). The other one you press to turn on, and it stays on. This one you have to hold it to stay on. I like this one better as it is unlikely to come on (and stay on) in my pocket thereby wasting the battery.It's plenty bright to find something dropped in the dark, or even to walk down a country rode in the dark.UPDATE: After using it for 3 months, probably with usage for a couple minutes each week, the button has stopped working. Sometimes it comes on, sometimes it doesnt, sometime it flickers. I would not recommend this light.

I got tired of pulling out my phone to use as a flashlight to get my key in the key hole at night, so I decided to buy a little LED for my keyring. This light is perfect for what I need it for and is brighter then I expected. It's also smaller than I expected so when I shine it at the door I have to angle it down in order to get my key in. I could honestly aim it at the floor and have enough light to still be able to see so its no problem at all. Its cheap in price but not cheap in quality, you should definitely buy it!Pros:BrightSmallCon:I guess a con could be you have to hold the button down for the light to stay on, but that could also cause it to stay on in your pocket and lose battery life.