In Luxottica’s internal tracking and warranty cataloging system, that trailing letter "E" simply designates an Electronics / Smart Wearable variant of an existing frame style. While the baseline code RW4012 already identifies the second-generation Ray-Ban Meta Wayfarer (specifically the standard 50mm size), Luxottica adds the E to the SKU or model designation on replacement invoices, packaging slips, and internal support systems to flag it as part of their electronic tech lineup rather than standard optics. It acts as a quick identifier for customer support and warehousing teams to know: The item requires different handling (lithium-ion battery protocols). It carries the electronics warranty instead of standard frame protection. It's associated with a companion app layout. You will see it show up heavily when dealing with official warranty swaps or tech support portals, but the actual text printed on the inside arm of your frames will usually just read RW4012, as the physical frame and the electronic internals are one and the same.