The Apple Watch Series 9 features a 41mm starlight aluminum case with a matching starlight sport band in S/M size. Powered by the advanced S9 SiP with 64-bit dual-core processor and 4-core Neural Engine, this GPS-only model delivers exceptional performance with 64GB of storage capacity.

The Always-On Retina LTPO OLED display reaches up to 2000 nits of brightness for exceptional outdoor visibility, with edge-to-edge ion-X front glass and 326 pixels per inch. Advanced health monitoring includes ECG app capability, electrical and third-generation optical heart sensors, temperature sensing for cycle tracking with retrospective ovulation estimates, sleep tracking with sleep stages, and irregular heart rhythm notifications. The double tap gesture control and Digital Crown with haptic feedback provide intuitive navigation.

Safety features include Fall Detection, Crash Detection, and Emergency SOS with international emergency calling. The watch is water resistant to 50 meters and dust resistant with IP6X rating, making it suitable for swimming and outdoor activities. Comprehensive fitness tracking supports running with custom interval workouts and stride metrics, cycling with power zones and cadence monitoring, swimming with automatic stroke detection, hiking with topographic maps and backtrack GPS, plus dozens of other workout types including yoga, HIIT, dance, and functional strength training.

The built-in rechargeable lithium-ion battery provides up to 18 hours of normal use or up to 36 hours in Low Power Mode, with fast charging capability reaching 80% in about 45 minutes. Connectivity includes Wi-Fi 4, Bluetooth 5.3, L1 GPS with GNSS, Galileo, and BeiDou support, plus second-generation Ultra Wideband chip for precise location tracking. The watch weighs just 31.9 grams and fits wrists from 130-200mm. Note that this model with part number ending in LW/A does not include blood oxygen measurement capability on units sold in the United States beginning January 18, 2024. Requires iPhone Xs or later with iOS 17 or later.