Features.

Display.

• 1.57″ inch LTPO AMOLED capacitive touchscreen, 16M colors
• Resolution: 394 x 324 pixels (~326 ppi density)
• Multitouch
• 3D Touch display
• 1000 nits
• Sapphire crystal glass

Body.

• Dimensions: 40 x 34 x 10.7 mm (1.57 x 1.34 x 0.42 in)
• Weight: 40 g (1.41 oz)
• Stainless Steel frame; all-ceramic/sapphire crystal back
• 50m waterproof
• Electronic SIM card (Apple e-SIM)

Platform.

• Operating system: watchOS 5.0
• Chipset: Apple S4
• CPU: Dual-core
• GPU: PowerVR

Memory.

• 16GB ROM

Sound.

• Loudspeaker

Communication.

• Wi-Fi 802.11 b/g/n
• Bluetooth 5.0, A2DP, LE
• GPS with A-GPS, GLONASS, GALILEO, QZSS
• NFC

Other features.

• Sensors: Accelerometer, gyro, heart rate (2nd gen), barometer
• Siri natural language commands and dictation (talking mode)

Battery.

• Non-removable Li-Ion battery