I'm pretty sure I've looked at one of these before, but there's no harm in opening another one.
This one appears to have skimped a bit on the output voltage, so it doesn't seem to work well on tiny flies, but does work on larger bugs.

The output discharge resistor is actually 22 Megohm. (red,red,blue - 2, 2, 6 zeroes.) That makes more sense than the 2.2Mohm value.

I did a thermal test on the transistor and it only clocked in at around 30C so it's not being run too hard. I didn't test the battery current as I couldn't get my DC clamp around a primary current path.

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