B20 L2 U3 is using CREE XM-L2 U3 LED which has a lifespan of 50,000 hours. It is super bright, max output could be 1100Lm, beam throw could be 230m. B20 has a simple mode arrangement: Turbo-High-Mid-Low-Signal. Applies to 1*18650/18700 lithium battery.
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