Screen: AMOLED type, 1.39 inches, with a resolution of 454 x 454 pixels. Battery: 455 mAh capacity, lasts up to 14 days of normal use. Sensors: Continuous heart rate measurement, blood oxygen saturation (SpO2), and sleep and stress monitoring. Sports Activities: Supports 85 custom workout modes and 15 professional modes (such as running and swimming). Water Resistance: Water-resistant up to 50 meters (5 ATM). Memory: Internal storage capacity for about 500 songs and playback via Bluetooth headphones. Processor: Kirin A1 chip ensures very low power consumption. Color: Black Condition: Used