This may not be the smallest single AAA keychain flashlight available, but it resided on my keychain for about a year, until I got the iTP A03 Upgraded.
I bought it when it was marked down to about the equivalent of $12 USD so it's far from a high-end light. It seems reliable enough though, it has never caused me any problems.
These are all the specifications I have:
Diameter: 18mm
Length: 91mm
Weight: 25g
1 W Power LED
To my eyes it looks like the output is about 50 lm; it's similar or slightly brighter than the Zebralight SC51 on Medium 1 (30 lm)
The second picture shows a Maglite Solitare and a AAA battery for comparison.
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