Apple Watch Series 9 (45 mm, GPS, aluminium) / Apple Watch Ultra 2

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 Ultra 2: Apple Watch Ultra 2, 49 mm titanium case, GPS + Cellular; natural (2023) and black titanium added in 2024. Band options (Alpine Loop, Trail Loop, Ocean Band, Titanium Milanese Loop) vary by size. The Apple Watch Ultra (2022) and Ultra 3 (2025) are separate models.

Specification	Apple Watch Series 9 (45 mm, GPS, aluminium)	Apple Watch Ultra 2
Release year	2023	2023
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	Always-On Retina LTPO2 OLED; 410 × 502 pixels, 326 ppi; 1,185 mm² display area Brightness goes up to 3,000 nits and down to 1 nit in the dark. LTPO2 lowers the refresh rate to reduce battery use in always-on mode. 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	L1 + L5 dual-frequency GPS; GLONASS, Galileo, QZSS, BeiDou The L5 band helps reduce position errors where signals bounce, such as among tall buildings and dense trees. 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	Up to 36 hours in normal use and 72 hours in Low Power Mode; fast charge to 80% in about 1 hour; built-in lithium-ion The box includes a 1 m magnetic fast charger to USB-C cable; no 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, or iPhone SE (2nd generation or later), with iOS 18 or later The watch is set up and used only with an iPhone; it does not work with Android phones. Apple
Case	—	49 mm, Grade 5 titanium; natural or black; 49 × 44 × 12 mm Weight is 61.4 g in natural and 61.8 g in black. Fits 130–210 mm wrists. Apple
Glass	—	Flat sapphire crystal front Apple
Chip and storage	—	S9 SiP (64-bit dual-core processor, 4-core Neural Engine); 64 GB The S9 SiP can process Siri requests on the device and supports the double tap gesture (tapping thumb and index finger together twice). Apple
Sensors	—	Electrical heart sensor; third-generation optical heart sensor; temperature sensor; depth gauge; water temperature sensor; compass; always-on altimeter The electrical sensor runs the ECG app (age 22 and over). The temperature sensor is not for medical use; it supports retrospective ovulation estimates in cycle tracking. Apple
Diving and durability	—	100 m water resistance under ISO 22810:2010 (WR100); recreational scuba diving to 40 m under EN13319; IP6X under IEC 60529; MIL-STD 810H testing The depth gauge is accurate to ±1 m; Apple advises against diving below 40 m. The MIL-STD 810H tests cover altitude, temperature shock, freeze/thaw, shock and vibration. Apple
Cellular and wireless	—	4G LTE and UMTS; Wi-Fi 4 (802.11n); Bluetooth 5.3; second-generation Ultra Wideband chip Cellular use needs a carrier plan. Ultra Wideband enables precision finding of an iPhone; availability depends on the country. Apple
Controls and safety	—	Customisable Action button; Digital Crown with haptic feedback; siren; Emergency SOS, fall and crash detection The Action button is also used for Precision Start, beginning a workout recording at the exact start. The siren sounds a loud alert to call for help. Apple
Operating conditions	—	On wrist –20 to 55 °C; diving 0–40 °C; altitude –500 to 9,000 m Apple