The Apple Watch Series 7 was announced in 2021, September 14 With 1.9 inches Retina LTPO OLED, 1000 nits (peak), Powered by Apple S7 and running watchOS 8.0, up to 8.7, planned upgrade to watchOS 9.0, the device delivered smooth performance and multitasking capabilities. while the Li-Ion 309 mAh (1.19 Wh), non-removable ensured long-lasting usage.