Construction: Aluminum frame SIM eSIM, glass front, and plastic/sapphire crystal back. 50m water resistant. Display Type: Retina LTPO OLED, peak brightness of 1000 nits. 1.78 inches in size. 448 x 368 pixels with a density of about 326 pixels per inch. Ion-X strengthened glass for protection. Upgradeable to watchOS 10.5, PLATFORM OS watchOS 9.0. Apple S8 chipset. CPU with two cores. GPU PowerVR. 32GB and 1GB of internal RAM. AUDIO A loudspeaker Indeed. WLAN Wi-Fi 802.11 b/g/n for communications. 5.3 Bluetooth, LE, A2DP. GPS, GLONASS, GALILEO, and QZSS positioning. NFC Indeed. FEATURES Sensors: compass, barometer, always-on altimeter, accelerometer, gyro, and second-generation heart rate. Li-Ion 296 mAh non-removable battery type. Wireless charging.