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The second generation Apple Watch has two models; the Apple Watch Series 1 and Apple Watch Series 2.
The Series 1 has a variant of the dual-core Apple S2 processor with GPS removed, known as the Apple S1P. It has a lower starting price than first generation. The Series 1 was sold only in Aluminium casings.
The Apple Watch Series 1 and Apple Watch Series 2 are the final Apple Watch models available with Yellow Gold and Rose Gold aluminum case color options. They have an advertised 18 hours of battery life.
The software support for both Apple Watch Series 1 and Apple Watch Series 2 ended with watchOS 6.3.