Apple Watch Series 7 (45mm) vs Apple Watch Series 4 (44mm) Specs Comparison

Design

Dimensions
	1.73 x 1.50 x 0.42 inches 44.0 x 38.0 x 10.7 mm
Weight
1.34 oz (38.0 g)	1.29 oz (36.7 g)
Materials
Back: Aluminum	Frame: Aluminum
Resistance
Water, Dust; IP6X	Water
Colors
Midnight, Starlight, Green, Blue, Red	Silver, Black

Display

Size
	1.8-inch
Resolution
448x368px	448x368px, 326 PPI
Technology
OLED	OLED
Screen-to-body
	59.89 %
Peak brightness
	1000 cd/m2 (nit)
Features
	Pressure-sensitive, Scratch-resistant glass (Sapphire), Ambient light sensor

Hardware

System chip
Apple S7	Apple S4 (7 nm)
Processor
Dual-core	Dual-core
GPU
PowerVR	Apple G11M
RAM
1GB	1GB
Internal storage
32GB	16GB
Storage expansion
not expandable	not expandable
OS
watchOS (9.x, 8.x)	watchOS (9.x, 8.x, 7.x, 6.x, 5)

Battery

Capacity
	292 mAh
Type
Li - Ion
Charging
Qi wireless charging	Magnetic charging

Camera

Connectivity & Features

Bluetooth
5.0	5.0
WLAN
802.11 b,g,n	802.11 b,g,n
Location
A-GPS, Glonass, Galileo, BeiDou, QZSS	Glonass, Galileo, QZSS
Sensors
Accelerometer, Gyroscope, Altimeter, Compass, Heart rate, Barometer, Blood Oxygen	Accelerometer, Gyroscope, Heart rate, Barometer
Other
	NFC

Multimedia

Speakers
Loudspeaker	Loudspeaker
Additional microphone(s)
Yes	Noise cancellation

Cellular

3G
Bands 1(2100), 2(1900), 4(1700/2100), 5(850)
Data Speed
LTE-A, HSDPA+ (4G) 42.2 Mbit/s	LTE, HSPA
SIM type
eSIM	eSIM

Availability

Officially announced
Sep 14, 2021

Alternative variants

With Stainless Steel case

Weight	1.82 oz (51.5 g)
Materials	Back: Stainless steel

With titanium case

Weight	1.59 oz (45.1 g)
Materials	Back: Titanium

Links

Full specifications
Apple Watch Series 7 (45mm) Specs	Apple Watch Series 4 (44mm) Specs
PhoneArena Review
Apple Watch Series 7 (45mm) Review