Engraved by hand.
The Stratum OLC is internationally renowned, as being one of, if not THE smallest single regulated 18650 mod in existence on the market, and beautifully crafted to the utmost standard of craftsmanship in Russia.
WARNING: The Yihi SX350 chip does NOT have reverse polarity protection, and you WILL damage the device if you incorrectly insert the battery upside down! Please pay attention to battery direction markings in the sled when inserting your battery!
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