49MM Specifications: • 49mm Titanium Case — resistant to rust and scratches • Always-On Retina display with brightness up to 3000 nits (the brightest in Apple Watches) • S9 SiP processor with a quad-core neural engine • Double Tap feature and on-device Siri • 64GB storage • Battery lasts up to 36 hours, and up to 72 hours in power-saving mode • Water resistant up to 100 meters + certified for diving up to 40 meters (EN13319) • IP6X dust resistance and MIL-STD 810H durability standard • Depth gauge and water temperature sensor • Dual-frequency GPS (L1 + L5) for higher accuracy in routes and terrain • 86-decibel siren for emergencies • Customizable Action Button • Sensors: ECG, Blood Oxygen, Body Temperature, Irregular Heartbeat • Crash and Fall Detection + SOS Emergency Call • Precision Finding for iPhone Battery health 98%؜ Case Size: 49mm Condition: Used Color: Black Series: Apple Watch Ultra 2