I don’t think I have any functional samples. Haven’t carried this type of light for several years. No lights on my key chain.
Everybody should have one on the car keyring.
Wife swears by hers. and after around 6 or 8 yrs. I replaced it’s battery.
Cost more than the bloody lights…(freebie givaways)
They probably one of the most practical item a person can carry on themselves.
Although Mine is an Astrolux AO1 Nichia nowadays.
Photon 2 Microlight. Black with choice of colour, led.
Varying from $22 to $43 per light FREE FREIGHT.
Come up in the world a little methink’s.
20 min’s later…………………………
Just been on EBAY.
Chinese vers. dual battery choice of Colours.
5 for $2.70 or 10 for $3.85. Del.
That’s US. Works out at $10AUD with tax, freight, etc.
$1 AUD ea. (64c US) Super cheap novelty pressie’s for anybody
and actually useful.
I have four lights on my keychain. 
One Photon 2 clone and three real keychain lights.
I almost never use them, though, because they're my backup lights.
One of Dons threads .....cool !
i hotrod them with a ebay high cri led and a lir2032.
for the intended purpose they still last a long time on a charge and then you recharge rather than replace the cell.
did the same to a few original photons too.
I still have some of the clones laying around, but they likely all have dead batteries by now. One of these used to always be on my keychain for quick low lumen use, but it has since been replaced with a Nitecore Tube for more versatility and is easily rechargeable.
KuoH
We should get KD to do a run of their clones with the Yuji HiCRI LEDs