Apple Watch Ultra Titanium Case 49MM Trail Loop

49mm case size 100m water resistantfootnote² Swimproof and recreational diving to 40mfootnote² EN13319 certificationfootnote¹³ Depth gauge with water temperature sensor Certified IP6X dust resistant Tested to MIL-STD 810Hfootnote³ Customizable Action button Always-On Retina display Up to 2000 nits brightness Blood Oxygen appfootnote⁴ ECG appfootnote⁵ High and low heart rate notifications Irregular rhythm notificationfootnote⁶ Cardio fitness notifications Temperature sensingfootnote⁷ Cycle Tracking with retrospective ovulation estimatesfootnote⁸ Emergency SOSfootnote⁹ International emergency callingfootnote¹⁰