The Apple Watch Series 1 and Series 2 watches were released at the same time and have faster processors than the first-generation model, but the Series 2 has GPS, waterproofing for swimming workouts, and has a 1000-nit display. However, with the exception of the faster processor, the Series 1 makes little to no changes from the 1st generation. The first-generation Apple Watch is commonly called the Series 0 by the surrounding communities, but Apple itself doesn't use this name, instead referring to the Series 0 as "Apple Watch (1st generation)".