Enable Bluetooth Calling Function: First connect to the compatible app. Then manually go to the phone’s Bluetooth settings and pair the watch 3D HD Display : 1.28 Full Circle 3D HD bevel curved glass Comprehensive Health Data : Track your SPO2, Blood Pressure, Heart Rate Water Resistance: IP67 / IPX7 rating mentioned (at least splash/dust resistant) so some water protection though not always full swim-proof. Battery Life: Claims up to ~10 days with normal use, ~5 days with Bluetooth calling enabled. Practical reviews say lower. Connectivity: Bluetooth v5 for connectivity to smartphone; supports Bluetooth calling directly from watch (make/receive calls). Health & Fitness Features: Heart rate monitoring, SpO₂ (blood-oxygen) tracking, blood pressure monitoring (optical), multiple sports modes (walk, run, cycling, skipping, football, basketball, badminton, swimming) in some descriptions.