Display:

Always-On Retina LTPO OLED display
41mm: 352 x 430 pixels
45mm: 396 x 484 pixels
2000 nits maximum brightness

Processor:

S9 SiP with 64-bit dual-core processor
4-core Neural Engine

Storage Options:

64GB

Battery Life:

Up to 18 hours of normal use
Up to 36 hours in Low Power Mode
Built-in rechargeable lithium-ion battery
Fast charging capable (up to 80% charge in about 45 minutes)

Connectivity:

Wi-Fi (802.11b/g/n 2.4GHz and 5GHz)
Bluetooth 5.3
GPS/GNSS, GLONASS, Galileo, QZSS, and BeiDou
Optional LTE support

Dimensions and Weight:

41mm: 41 x 35 x 10.7 mm, 31.9g (Aluminium), 42.3g (Stainless Steel)
45mm: 45 x 38 x 10.7 mm, 38.7g (Aluminium), 51.5g (Stainless Steel)

Operating System:

watchOS 10, upgradable to watchOS 11.2

Additional Features:

Blood oxygen sensor (Blood Oxygen app)
Electrical heart sensor (ECG app)
Third-generation optical heart sensor
Temperature sensing
Always-on altimeter
Compass
Accelerometer up to 256 g-forces with fall detection and crash detection
Gyroscope
Ambient light sensor
Speaker and microphone
Apple Pay
Water resistant up to 50 metres
IP6X dust resistant

Colours:

Aluminium: Midnight, Starlight, Silver, Pink, (PRODUCT)RED
Stainless Steel: Graphite, Silver, Gold