Apple Watch Series 4

Dimensions- 44 x 38 x 10.7 mm (1.73 x 1.50 x 0.42 in)
Weight- 48 g (1.69 oz)
Build- Glass front (Sapphire crystal), ceramic/sapphire crystal back, stainless steel frame
SIM- eSIM
50m water resistant
ECG certified (region dependent SW application; HW available on all models)
DISPLAY Type Retina LTPO OLED, 1000 nits (peak)
Size 1.78 inches
Resolution 448 x 368 pixels (~326 ppi density)
Protection Sapphire crystal glass
3D Touch display

PLATFORM
OS- watchOS 5.0, upgradable to 9.4
Chipset- Apple S4
CPU- Dual-core
GPU- PowerVR
MEMORY Card slot- No
Internal- 16GB 1GB RAM
CAMERA- No
SOUND Loudspeaker- Yes
3.5mm jack- No

COMMS
WLAN- Wi-Fi 802.11 b/g/n
Bluetooth- 5.0, A2DP, LE
Positioning- GPS, GLONASS, GALILEO, QZSS
NFC- Yes
Radio- No
USB- No

FEATURES
Sensors Accelerometer, gyro, heart rate, barometer
Natural language commands and dictation (talking mode)
BATTERY Type Li-Ion 292 mAh (1.12 Wh), non-removable
Charging Wireless