Monitoring your blood oxygen levels by intelligently monitoring your (SpO2) blood oxygen levels. Basic Usage Battery Life: 21 days Super-Light weight body with only 19.5 grams, 8.95 MM Thin body, comfortable to wear day & night and during sports activities. 1.55 AMOLED Display with high 314 PPI Resolution for a crystal clear image and sharp details. 70+ built-in sports modes and 5 ATM water-resistance. 24H Heart Rate Tracking, Female cycle tracking, Sleep quality monitoring, Stress level monitoring and BIO tracker 2 PPG. Bluetooth music control directly from your watch while exercise without having to pull out your phone.