Apple Watch Series 9 (45 mm, GPS, aluminium) / Apple Watch SE (2nd generation, 44 mm)

Apple Watch Series 9 (45 mm, GPS, aluminium): 45 mm aluminium case, GPS model; Pink, Midnight, Starlight, Silver and (PRODUCT)RED. The 41 mm, GPS + Cellular and stainless steel (sapphire crystal) versions differ in size and materials.

Apple Watch SE (2nd generation, 44 mm): Apple Watch SE (2nd generation), 44 mm aluminium case; GPS and GPS + Cellular models. The 40 mm case, the original Apple Watch SE (2020) and Apple Watch SE 3 are separate models.

Specification	Apple Watch Series 9 (45 mm, GPS, aluminium)	Apple Watch SE (2nd generation, 44 mm)
Release year	2023	2022
Display	Always-On Retina LTPO OLED; up to 2000 nits, as low as 1 nit; 326 ppi LTPO is a panel technology that can lower the refresh rate dramatically, letting the display stay dimly on when the wrist is down. The 1-nit minimum avoids glare in a dark room. Apple	Retina LTPO OLED; 368 × 448 pixels, 977 sq mm display area, 326 ppi; up to 1000 nits; Ion-X glass SE has no always-on mode; the screen wakes when you raise your wrist. Ion-X is strengthened glass and is not as scratch-resistant as sapphire. Apple
Chip	S9 SiP; 64-bit dual-core processor, 4-core Neural Engine Apple	—
Storage	64 GB Apple	—
Controls	Digital Crown with haptic feedback, side button, double tap gesture Double tap lets you answer notifications or calls by tapping the thumb and index finger of the watch hand together twice, without touching the screen. Apple	—
Health sensors	Electrical heart sensor, third-generation optical heart sensor, temperature sensing The electrical sensor is for ECG recordings; the optical sensor measures pulse with light. Temperature sensing tracks overnight changes in wrist temperature. Apple	—
Blood Oxygen (US)	On watches sold in the US without the feature, a redesigned version arrives with iOS 18.6.1 and watchOS 11.6.1; the reading is calculated on iPhone The watch collects sensor data, the paired iPhone calculates the value and shows it in the Health app. Watches bought outside the US are not affected. Apple	—
Other sensors	Compass, always-on altimeter, high-g accelerometer, high dynamic range gyroscope, ambient light sensor Apple	—
Location	L1 GPS, GNSS, Galileo and BeiDou It is a single-frequency (L1) receiver; drift in cities can be more likely than with dual-frequency watches. Apple	—
Wireless	Wi-Fi 4 (802.11n), Bluetooth 5.3, second-generation Ultra Wideband Ultra Wideband lets you locate an iPhone 15-family phone with Precision Finding showing direction and distance; availability varies by region. Apple	—
Battery and charging	Up to 18 hours normal use, up to 36 hours in Low Power Mode; fast charge to about 80% in 45 minutes Fast charging requires Apple’s fast-charging cable and a suitable adapter. Apple	—
Durability	50 m water resistant (ISO 22810:2010); IP6X dust resistant; Ion-X front glass Suitable for swimming. Ion-X is the strengthened glass used on aluminium cases; steel cases use sapphire crystal. Apple	—
Size and weight	45 × 38 × 10.7 mm; 38.7 g; fits 140–245 mm wrists Apple	—
Compatibility	iPhone XS or later with iOS 17 or later It cannot be used with Android phones. Apple	iPhone Xs or later with iOS 18 The watch can only be set up and used with an iPhone; it does not work with Android phones. Apple
Case and weight	—	44 × 38 × 10.7 mm aluminium case; GPS 32.9 g, GPS + Cellular 33 g Weight is for the case only and rises with the band. The 44 mm case fits 140–245 mm wrists. Apple
Chip and storage	—	S8 SiP (64-bit dual-core processor); 2-core Neural Engine; 32 GB Storage holds music, podcasts and apps and cannot be expanded. Apple
Sensors	—	2nd-gen optical heart sensor; compass; always-on altimeter; high-g accelerometer; high dynamic range gyroscope; ambient light sensor The high-g accelerometer and gyroscope are used for Crash Detection. ECG, blood oxygen and temperature sensors are not included on this model. Apple
Safety features	—	Emergency SOS; International Emergency Calling; Fall Detection; Crash Detection Crash Detection can call emergency services after a severe car crash. Emergency SOS needs a cellular connection or Wi-Fi calling with internet access from the watch or a nearby iPhone. Apple
Battery	—	Up to 18 hours; about 80% charge in about 1.5 hours Apple measures 18 hours with 90 time checks, 90 notifications, 45 minutes of app use and a 60-minute workout with music; on the cellular model, 4 of those hours are on LTE. Longer GPS workouts shorten it. Apple
Water resistance	—	50 metres under ISO 22810:2010 Suitable for swimming, but not for scuba diving, water skiing or high-velocity water sports. Apple
Location and wireless	—	L1 GPS, GNSS, Galileo and QZSS; Wi-Fi 4 (802.11n); Bluetooth 5.3; LTE and UMTS on the GPS + Cellular model The cellular model can make calls and use data without your iPhone nearby; carrier support is required. Apple
Colours	—	Midnight, Starlight and Silver Apple