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Basic Information Display 1.78" (368 x 448) AMOLED display Battery Battery capacity: 230 mAh About 12 days (24 hours heart rate monitoring) Connectivity Bluetooth V5.1 OS Android 6.0 and above, iOS 11.0 and above. Supported functions will vary with different watches, mobile phones, and countries. Sensor Heart rate sensor, motion sensor, blood oxygen sensor