Apple has upgraded the storage to 64GB across all SE 3 models. This is a massive jump from the 32GB on the SE 2, allowing you to store significantly more music, podcasts, and offline maps directly on the watch.

The SE 3 offers 18 hours of normal use and up to 32 hours in Low Power Mode. Crucially, it now supports Fast Charging: you can get up to 8 hours of normal use with just a 15-minute charge, or a full 8 hours of sleep tracking in 8 minutes.

Yes, it has a 50-meter water resistance rating (ISO 22810:2010). It is perfectly safe for pool swimming, shallow ocean swimming, and showering.

The SE 3 now includes a Wrist Temperature Sensor. This hardware enables two key features: deeper insights in the Vitals app (to spot early signs of illness) and Retrospective Ovulation Estimates for cycle tracking. It also supports Sleep Apnea notifications.

Yes. This is the biggest upgrade for the 3rd generation. The SE 3 features an Always-On Retina OLED display with up to 1,000 nits of brightness. You can now glance at the time or your workout metrics without having to raise your wrist or tap the screen.