I'm guessing the answer is the three mode ...opps I mean 2 mode and a strobe .

I like how the trend now is for dimmer lights that have longer runtime ..

How about the sofirn Sf10 that runs 6 -7$ a AA 4 mode that starts in high , has 4 nicely spaced modes,takes the old style bolt on convoy s2 clip but..some bad low frequency pwm . If you're buying a C1 from them you might want tyo toss in a sf10 or even a sp10 for fun ...I still like the original $2 zoomie over the sk68 clones