Apple Watch Series 4 40mm
Display: 1.78 inches, 448 x 368 pixels
Display type: LTPO AMOLED screen, 16M colors
Sensors: Accelerometer, Heart Rate, Gyro, Barometer
Connectivity: Bluetooth 5.0, NFC, WiFi, GPS, GLONASS, GALILEO, QZSS
Key features: 50m waterproof, Sapphire crystal glass, 3D Touch, Siri