600 nits (peak) AMOLED display type Dimensions: 1.75 inches 450 x 390 pixels with a density of about 341 ppi Constantly visible Waterproof (5ATM) 50m water-resistant Sound Platform OS Proprietary OS Yes, a loudspeaker LE Positioning GPS, Bluetooth 5.2, A2DP, GLONASS, GALILEO, BDS, and QZSS NFC Indeed. FEATURES: compass, gyro, accelerometer, heart rate, and SpO2 battery Li-Ion type, non-removable, 289 mAh