The 5141 and 5125 differ in performance.
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The Qualcomm QCC5141 SoC also makes this headset one of the first true wireless products to feature this new solution. The new QCC5141 SoC is optimized specifically for true wireless earplugs and earwear devices, and brings more robust connectivity, longer battery life and a series of intelligent \"black technologies\" to Libratone AIR through many technical features to meet users' ultimate pursuit of diversification of top true wireless products.
In terms of Qualcomm's two chips, in fact, there are still technical changes, 5125 is 5.1 Bluetooth, with a single-core audio subsystem, 5141 is 5.2 Bluetooth, with a dual-core audio subsystem.