Apple Watch Series 4

• GPS + Cellular.

• Over 30% larger display and 50% louder speaker.

• Electrical and optical heart sensors. Up to 18 hours of battery life. Water resistant 50 meters.

• Digital Crown with haptic feedback.

• 50% louder speaker.

• S4 Sip with faster 64-bit dual-core processor.

• Improved accelerometer and gyroscope for fall detection.

• Swim proof.

• WatchOS 5.

• Aluminum or stainless steel case.