The Apple Watch Series 1 and Apple Watch Series 2 are the second-generation models of the Apple Watch and was released on September 16, 2016. They use the Apple S1P and Apple S2 SIPs, respectively, and the Series 2 has a built-in GPS and twice the display brightness of the previous generation for easier outdoor readability. The Apple Watch Series 1 and 2 requires at least an iPhone 5 with iOS 10 or later.
Features
Apple Watch Series 2 introduces water resistance at a rating of 50 meters. It can keep track of the number of laps and distance during Swimming workouts. During swimming, the touch function can be manually disabled with 'Underwater mode'. Once this is turned off, by rotating the Digital Crown continuously, it uses the speaker to expel residual water through a series of 10 vibrations. The Apple Watch Series 2 has a built-in GPS system. The most recently used apps are saved in the background, so apps and information load faster. The Apple Watch Series 2 was sold in casings of anodized Aluminium, starting at $369, and polished Stainless Steel, starting at $549.The Series 1 was sold only in Aluminium, with a starting price at $269. The Series 2 still needs to be charged nightly, with an advertised 18 hours of battery life, in line with its predecessors. The display is also brighter, from 450nits to 1000.
Software
The Apple Watch Series 1 and 2 was first released with watchOS 3 preinstalled and is still compatible today with the newest version, watchOS 6.1. However, both Series 1 and 2 will not receive watchOS 7 which is due in the fall of 2020.
Confusion
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 ".
