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	Compare with Apple Watch Series 4 Aluminum	Compare with Apple Watch Series 3 Aluminum
Full Differences Change compare mode	Specs ALL VERSIONS44MM (GPS + CELLULAR)44MM (GPS)40MM (GPS + CELLULAR)40MM (GPS)	Specs ALL VERSIONS42MM - Series 3 (GPS + Cellular) requires an i..42MM (NO LTE) - Series 3 (GPS) requires an iPh..38MM - Series 3 (GPS + Cellular) requires an i..38MM (NO LTE) - Series 3 (GPS) requires an iPh..

Apple Watch Series 4 Aluminum

Apple Watch Series 3 Aluminum

Network
Technology	GSM / HSPA / LTE	GSM / HSPA / LTE
2G bands	GSM 850 / 900 / 1800 / 1900	GSM 850 / 900 / 1800 / 1900
3G Network	HSDPA 850 / 900 / 2100 / 800 - Europe, Australia	HSDPA 850 / 900 / 2100 / 800 - Europe, Australia (A1891)
	HSDPA 850 / 1700(AWS) / 1900 / 800 - USA, LATAM, Canada	HSDPA 850 / 1700(AWS) / 1900 / 800 - USA, LATAM, Canada (A1861)
	HSDPA 2100 - China	HSDPA 2100 - China (A1892)
4G Network	1, 3, 5, 7, 8, 18, 19, 20, 26 - Europe, Australia	1, 3, 5, 7, 8, 18, 19, 20, 26 - Europe, Australia (A1891)
	2, 4, 5, 12, 13, 17, 18, 19, 25, 26, 41 - USA, LATAM, Canada	2, 4, 5, 12, 13, 17, 18, 19, 25, 26, 41 - USA, LATAM, Canada (A1861)
	1, 3, 39, 40, 41 - China	1, 3, 39, 40, 41 - China (A1892)
Speed	HSPA, LTE	HSPA, LTE

Launch
Announced	2018, September	2017, September
Status	Available. Released 2018, September	Available. Released 2017, September

Body
Dimensions	44 x 38 x 10.7 mm (1.73 x 1.50 x 0.42 in)	42.5 x 36.4 x 11.4 mm (1.67 x 1.43 x 0.45 in)
Weight	36.7 g (1.31 oz)	34.9 g (1.23 oz)
Build	Glass front, ceramic/sapphire crystal back, aluminum frame	Glass front, ceramic back, aluminum frame
SIM	eSIM	eSIM
	50m water resistant ECG certified (region dependent SW application; HW available on all models)	50m water resistant

Display
Type	Retina LTPO OLED, 1000 nits (peak)	Retina OLED, 1000 nits (peak)
Size	1.78 inches	1.65 inches
Resolution	448 x 368 pixels (~326 ppi density)	390 x 312 pixels (~303 ppi density)
Protection	Ion-X strengthened glass	Ion-X strengthened glass
	3D Touch display	3D Touch display

Platform
OS	watchOS 5.0, upgradable to watchOS 10.4	watchOS 4.0, upgradable to watchOS 8.7
Chipset	Apple S4	Apple S3
CPU	Dual-core	Dual-core
GPU	PowerVR	PowerVR

Memory
Card slot	No	No
Internal	16GB 1GB RAM	8GB 768MB RAM, 16GB 768MB RAM

Main Camera
Modules	No	No

Selfie Camera
Modules	No	No

Sound
Loudspeaker	Yes	Yes
3.5mm jack	No	No

Comms
WLAN	Wi-Fi 802.11 b/g/n	Wi-Fi 802.11 b/g/n
Bluetooth	5.0, A2DP, LE	4.2, A2DP, LE
Positioning	GPS, GLONASS, GALILEO, QZSS	GPS, GLONASS
NFC	Yes	Yes
Infrared port	No	No
Radio	No	No
USB	No	No

Features
Sensors	Accelerometer, gyro, heart rate, barometer	Accelerometer, gyro, heart rate, barometer
	Natural language commands and dictation (talking mode)	Natural language commands and dictation (talking mode)

Battery
Type	Li-Ion 292 mAh (1.12 Wh), non-removable	Li-Ion 341 mAh (1.34 Wh), non-removable
Charging	Wireless	Wireless

Misc
Colors	Silver, Gold, Space Gray	Silver, Gold, Space Gray
SAR		0.52 W/kg (head)     0.34 W/kg (body)
Models	A1975, A1976, A2007, A2008, A1977, A1978	A1860, A1861, A1889, A1891, A1890, A1892, A1858, A1859
Price	About 430 EUR	About 480 EUR