Dimensions 44 x 38 x 10.7 mm (1.73 x 1.50 x 0.42 in) Weight 47.1 g (1.66 oz) Build Glass front (Sapphire crystal), ceramic/sapphire crystal back, stainless steel frame SIM eSIM 50m water resistant ECG certified (region dependent SW application; HW available on all models) DISPLAY Type Retina LTPO OLED, 1000 nits (peak) Size 1.78 inches Resolution 448 x 368 pixels (~326 ppi density) Protection Sapphire crystal glass PLATFORM OS watchOS 7.0, upgradable to watchOS 26.2 Chipset Apple S6 CPU Dual-core GPU PowerVR MEMORY Card slot No Internal 32GB 1GB RAM