DISPLAY Type AMOLED, 600 nits (peak) Size 1.75 inches Resolution 450 x 390 pixels (~341 ppi density) Always-on display Waterproof (5ATM) 50m water resistant PLATFORM OS Proprietary OS SOUND Loudspeaker Yes Bluetooth 5.2, A2DP, LE Positioning GPS, GLONASS, GALILEO, BDS, QZSS NFC Yes FEATURES Sensors Accelerometer, heart rate, compass, gyro, SpO2 BATTERY Type Li-Ion 289 mAh, non-removable