Apple Watch Series 4 (40mm)

Full Specifications

Released · September 2018

1.6-inch · 394x324px

225 mAh

1GB · 16GB

Apple S4

watchOS 9.x

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Popular Comparisons

The Apple Watch Series 4 (40mm) is most commonly compared with these phones:

• 

  Apple Watch Series 4 (40mm)
  vs
  

  Apple Watch Series 4 (44mm)
• 

  Apple Watch Series 4 (40mm)
  vs
  

  Apple Watch Series 9 (41mm)
• 

  Apple Watch Series 4 (40mm)
  vs
  

  Apple Watch Series 5 (40mm)
• 

  Apple Watch Series 4 (40mm)
  vs
  

  Samsung Galaxy S23 Ultra
• 

  Apple Watch Series 4 (40mm)
  vs
  

  Samsung Galaxy S23

Design
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
This device has different variants: View all

Display
Size	1.6-inch
Resolution	394x324px, 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
Storage expansion	not expandable
OS	watchOS (9.x, 8.x, 7.x, 6.x, 5)

Battery
Capacity	225 mAh
Charging	Magnetic charging

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

Multimedia
Speakers	Loudspeaker
Additional microphone(s)	Noise cancellation

Cellular
Data Speed	LTE, HSPA
SIM type	eSIM

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Alternative variants

With stainless steel case

Differences from the main variant:
Weight	1.40 oz (39.8 g)
Materials	Frame: Stainless steel