Announced during Apple's Sept. 12, 2018 keynote, the Apple Watch Series 3 comes in two versions: GPS or GPS + Cellular. The Apple Watch 3 (GPS) starts at $329 (USD) and is available in three case types: Aluminum, Stainless Steel and Ceramic. Band types include Sport Loop, Sport, Leather and Stainless Steel. The Series 3 also features a faster dual-core processor compared to the Series 1 and 2, as well as a W2 chip. Running watchOS4, the Series 3 provides users with up to 18 hours of battery life and is water resistant up to 50 meters. Other features include Bluetooth 4.2 support, a heart rate sensor, and barometric altimeter.