Display Type: Retina LTPO OLED, peak brightness of 2000 nits Dimensions: 1.9 inches 484 x 396 pixels with a density of about 326 ppi Construct Stainless steel frame, glass front, and ceramic or sapphire crystal back Protection Sapphire crystal glass, IP6X certified, 50m water resistant, ECG certified, and HW certified Constantly visible The watchOS 10 platform can be upgraded to the watchOS 10.2 chipset. Dual-core GPU PowerVR Internal 64GB Sound Apple S9 CPU A loudspeaker Indeed. COMMS WLAN Dual-band 802.11 b/g/n LE Positioning GPS, Bluetooth 5.3, A2DP, GLONASS, GALILEO, QZSS, and BDS NFC Indeed. ASPECTS Accelerometer, gyro, barometer, heart rate, compass, always-on altimeter, SpO2, VO2max, and body temperature Sensing temperature (0.01˚ accuracy) Support for Ultra Wideband 2 (UWB) Li-Ion 308 mAh non-removable battery Wireless charging, 0-80% in 45 minutes (promotional)