Build: Glass front, plastic/sapphire crystal back, aluminum frame SIM eSIM. 50m water resistant. DISPLAY Type Retina LTPO OLED, 1000 nits (peak). Resolution: 448 x 368 pixels (~326 ppi density). Protection Ion-X strengthened glass. PLATFORM OS watchOS 9.0, upgradable to watchOS 10.5. Chipset Apple S8. CPU Dual-core. GPU PowerVR. Internal 32GB 1GB RAM. SOUND Loudspeaker Yes. COMMS WLAN Wi-Fi 802.11 b/g/n. Bluetooth 5.3, A2DP, LE. Positioning GPS, GLONASS, GALILEO, QZSS. NFC Yes. FEATURES Sensors Accelerometer, gyro, heart rate (2nd gen), barometer, always-on altimeter, compass. BATTERY Type Li-Ion 296 mAh, non-removable. Charging Wireless.