Apple Watch Ultra 4

63 g (2.22 oz)

49 x 44 x 12 mm (1.93 x 1.73 x 0.47 in)

IP6X certified
100m water resistant (22810:2010)
40m swimproof/diving (EN13319)

1.98 inches

Sapphire crystal glass
Wide-angle OLED

514 x 422 pixels (~326 ppi density)

Retina LTPO3 OLED, 3000 nits (peak)

64GB

Accelerometer, gyro, always-on heart rate, barometer, always-on altimeter (-500m to 9000m), compass, SpO2, VO2max, temperature (body), temperature (water)
    Health Sensing System: third‑generation electrical heart sensor, always‑on optical heart sensor, blood oxygen sensor, temperature sensor
Temperature sensing (0.01˚ accuracy)
Depth gauge (±1m accuracy)
Ultra Wideband (UWB) support (gen2 chip)
Emergency SOS via satellite

Apple S11

GPS (L1+L5), GLONASS, GALILEO, BDS, QZSS

Wi-Fi 802.11 b/g/n, dual-band

Yes

5.3, A2DP, LE

Yes