Apple Watch 42mm
Launch: 2014, September. Released 2015, April
Network: No cellular connectivity
OS: watchOS 1.0, upgradable to 4.3.2
Display: Retina OLED, 450 nits (peak)
Chipset: Apple S1 (28 nm)
Battery: Li-Ion 250 mAh (0.94 Wh), non-removable
Models: A1554