Featuring a stunning, new black titanium case. The lightweight titanium case is rugged and corrosion resistant, and it's raised to protect the sapphire crystal from edge impacts. Water resistance 100m, and up to 40m for recreational dives now certified to EN13319, and IP6X dust resistance. Always‐On Retina display is 3000 nits at its peak, making it even more readable in harsh sunlight. Night Mode activates automatically in the dark. Up to 36 hours battery life (72 hours on low power mode). The customizable Action button gives you precise control over starting a workout, marking a segment, or moving on to the next interval. Training load provides helpful insights to make it easier for you to see the impact your workouts have on your body over time. Custom Workouts let you tailor workouts to your needs. You are automatically guided through timed intervals of work and recovery in the pool — with haptics to let you know when it’s time to move to the next interval. And now you can see the water temperature right from your workout.