Great light. The other brand I had required you to hold the button down continuously -- which actually hurt my fingers because it required so much pressure.

In reply to one review, you have to find and follow the directions on how to take the light out of "demo mode" on one of the inside flaps of the box. Then it will stay on, etc.

I have this light clipped to my key chain. I have had other keychain lights before and most of them died or fell apart within months of purchase. The light is clean white. I have even used it to escort someone who had trouble seeing the walkway at night. Not all of modes worked as stated. It can be dimmed by pressing while on. It uses 2 2016 button batteries -or 1 2032. I have a 2032 battery charger, but the non-rechargeable batteries seem to have a longer life. I've had mine for 2+ yrs. If you can get this without the shipping charge great. There is enough light distributed thru the translucent plastic case to make this suitable for leaving on while you are trying to find a keyhole in the dark.

For an Alexander Hamilton, you get a really spiffy flashlight for your keychain. I do have a couple of reservations, but I still strongly recommend it.

This little thing is one inch square and the thickness of 5 quarters. It goes on your keychain, and is small enough to be inconspicuous in your pants pocket. Despite its diminutive size, you get a surprisingly large amount of useable light for those everyday tasks. It uses a 5mm LED, and I compared it to a number of other similar items (especially: Gerber Tempo); the brightness of the X was on par with the others, neither significantly weaker nor stronger than the rest. It is quite convenient and very useful. I knocked it down one notch because I can get a similar flashlight for less, and another notch because of the yucky color of the light.

On the down side, I have a number of no-name Photon knock-offs that cost less. The light these cheapies give is indistinguishable from the X, so is the X really worth the extra $$$? The color of the light is the usual pastel baby-blue, but the corona is an awful, seasick-green, and is not that pleasant; this lack of attention to detail is surprising from such a well respected company.

The main issue is the controversial computer control. You can just click the button on and off, and this is how I suggest you use this light and ignore the computer modes. If you hold down the ON button, it cycles through several modes: reduced intensity, beacon/flash, SOS, strobe. Honestly, I cannot imagine that you will ever use these computer modes. Perhaps: emergency survival, dogs that are allowed out at night off leash, children at Halloween. I have had this or a similar item on my keychain regularly, and I have never used anything other than the basic ON/OFF.

I should also note that replacement batteries cost as much as the flashlight itself, and is difficult to do. Another reason to look elsewhere for a good keychain flashlight.

At first i was sceptical at how good could be this light and ive bought
4 of them, when ive got them i was stunned from the quality of the light.
Soon after ive bought another bunch of 4 and i will buy some more of them
soon.

The only minus side was that could not find easily how the light can stay
on and dont turn itself off after 7-8 secs, ive discover this option by
pure luck and playing with the on/off button.

Great little light. Very handy at night time when looking in the trunk or saddlebags of my motorcycle, or for looking at things in the "cockpit" after dark.