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The second generation Apple Watch has two models; the Apple Watch Series 1 and Apple Watch Series 2.
The Series 2 has the dual-core Apple S2 processor, water resistance to 50 meters, a display twice as bright, at 1,000 nits, and a GPS receiver. The Series 2 was sold in casings of anodized aluminum, stainless steel and ceramic.
The Apple Watch Edition Series 2 is the first Apple Watch model to add the new White ceramic case color option. Both Yellow Gold and Rose Gold 18K gold case color options have been removed.
The Apple Watch Nike+ Series 2 is the first Apple Watch model available as the Nike, Inc. collaborate special option.
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.