Apple Watch patient profile:

LTPO OLED Retina display with Force Touch

The Series 4 again comes in two sizes: 40 mm (324 × 394 pixels) and 44 mm (368 × 448 pixels).

Custom-designed Apple 64-bit dual-core S4 SiP (System in Package)

Optional LTE and UMTS, built in GPS/GLONASS/Galileo/QZSS, NFC, Wi-Fi 802.11b/g/n 2.4 GHz, and Bluetooth 5.0

Improved accelerometer and gyroscope, optical and electrical heart sensors, microphone, speaker, barometric altimeter, and ambient light sensor

Water resistance rating (up to 50 meters)

WatchOS 5