Apple Watch Ultra 4 - Silver - 49mm

Yes, it is designed for water resistance up to 100m and is suitable for recreational scuba diving and high-speed water sports.

Emergency SOS via satellite engages automatically when you trigger an emergency call in an area without cellular or Wi-Fi coverage.

Yes, the 49mm model is compatible with most standard Apple Watch bands, provided they are sized for the larger case dimensions.

It is calculated by analyzing your sleep stages, resting heart rate, heart rate variability, and recent activity intensity.

Yes, as long as the watch is worn during sleep and the Sleep Focus mode is configured, it will track your sleep cycles and quality.

The aerospace-grade titanium is designed to be highly resistant to corrosion and impacts, making it ideal for harsh outdoor environments.

Ensure Bluetooth is enabled on your iPhone and restart both the watch and the phone to re-establish the connection.

Check the Display & Brightness settings in the Watch app and ensure the 'Auto-Brightness' toggle is switched on.

Review 'Background App Refresh' settings and disable apps that do not require constant updates, or turn on Low Power Mode during inactive periods.