Old versions of Atlantis don't support 4K upgrading, they were using BK MCU. So we're increasing 2 new versions for OG V2 and MINI, they are driven by Nordic 52840 MCU, one is Atlantis 4K, the other is Atlantis Pro. Atlantis 4K version is bundled with black 4K dongle inside the package (both Charcoal black OG V2 and MINI are available for this 4K version, default setting is 1K for power saving, user need to download software to change to 4K polling rate ). Atlantis Pro version is with 1K dongle inside the package, user need to separately buy the colorful 4K dongle to upgrade( available colors, Polar white and Nachocustomz collaborated Elegant blue for both OG and MINI), after re-paring the dongle, it can be used on different LAMZU mice models, We will provide universal driver for Atlantis with Nordic MCU, so user only need to use one software for 4K and Pro versions, this software is different with old versions.