Updated : Jan 17, 2023, 6:40 AM

Apple Watch Series 4 (40mm) Specs

Released

September 2018

Display

1.6-inch
394 x 324 px

Battery

225 mAh

Storage

16GB

Hardware

Apple S4
1GB RAM

OS

watchOS 9.x

Description

The Apple Watch Series 4 (40mm) comes with 1.57-inch OLED display and Apple S4 processor. Specs also include heart rate sensor, barometer and LTE connectivity.

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Popular Comparisons

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Specs Compare

Display
Size:	1.6-inch
Resolution:	394 x 324 px, 325 PPI
Technology:	OLED
Screen-to-body:	57.48 %
Peak brightness:	1000 cd/m2 (nit)
Features:	Pressure-sensitive, Scratch-resistant glass (Sapphire), Ambient light sensor

Hardware
System chip:	Apple S4 (7 nm)
Processor:	Dual-core
GPU:	Apple G11M
RAM:	1GB
Internal storage:	16GB, not expandable
OS:	watchOS (9.x, 8.x, 7.x, 6.x, 5)
Device type:	Smartwatch

Battery
Capacity:	225 mAh
Type:	Not user replaceable
Charging:	Magnetic charging

Design Size comparison
Dimensions:	1.57 x 1.34 x 0.42 inches (40.0 x 34.0 x 10.7 mm)
Weight:	1.06 oz (30.1 g)
Materials:	Frame: Aluminum
Resistance:	Water
Colors:	Silver, Black

Cellular
Data Speed:	LTE, HSPA
SIM type:	eSIM

Multimedia
Speakers:	Loudspeaker
Additional microphone(s):	Noise cancellation

Connectivity & Features
Bluetooth:	5.0
Wi-Fi:	802.11 b, g, n
Location:	Glonass, Galileo, QZSS
Sensors:	Accelerometer, Gyroscope, Heart rate, Barometer
Other:	NFC

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