Navigation : Capacitive touch (tap, swipe)
Force touch (press)
Digital crown (scroll, zoom, home, time,
accessibility, Siri)
Button (Friends, Apple Pay, power)
Sensors : Ambient light
Accelerometer
Gyroscope
Heart rate
Connectivity : Bluetooth 4.0 Low Energy (LE)
Wi-Fi 802.11b/g/n 2.4 GHz (system use only)
Battery life : 18 hours
3 hours talk time
6.5 hours audio playback
6.5 hours workout use
48 hours time check
72 hours power reserve (time only)
Inductive charging time : 1.5 hours to 80%
2.5 hours to 100%
Water resistance : IPX7 under IEC standard 60529
Processors : Apple S1 computer-on-a-chip
Storage : 8 GB total
2 GB for music
75 MB for photos
Display sizes : 38 mm: 340 x 272 pixels
42 mm: 390 x 312 pixels
Case sizes : 38.6 mm high, 33.3 mm wide, 10.5 mm deep
42 mm high, 35.9 mm wide, 10.mm deep