Introducing Apple Watch Series 4. Fundamentally redesigned and re-engineered to help you stay even more active, healthy, and connected.

The largest Apple Watch display yet. New electrical heart sensor. Re-engineered Digital Crown with haptic feedback. Entirely familiar, yet completely new, Apple Watch Series 4 resets the standard for what a watch can be.

44mm size (larger); Space Grey Aluminum Case; Black Sport Band

GPS + Cellular Connectivity

https://www.apple.com/apple-watch-series-4/