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Apple Watch Series 4 · Apple Newsroom — Images-of-Apple-Watch-Series-4/Apple-Watch-Series4_Gold-stainless-steel_09122018.jpg

Apple · Apple Watch

Watch Series 4

Released September 2018

The Series 4 introduced larger 40mm and 44mm displays, an electrical heart sensor and fall detection in a thinner case.

Model history · 4 models, 2015–2018

Type: Smart and sports
Sizes: 40, 44 mm
Movement: –
Power reserve: –
Display: LTPO OLED
Battery: 18 h
Water: 50 m
GPS: Single-band
Weight: 30.1 g

Mobile data

What reviewers say

Wareable and PhoneArena praise the larger display, comfortable fit, quick performance and heart-rate tracking. Both find Siri and automatic workout detection inconsistent and criticise the price. PhoneArena's GPS model lasted substantially longer than Apple's claim; Wareable still considers battery life a limitation.

From wareable.com and phonearena.com

Specifications

Report a wrong or missing spec

Display

Case sizes: 40 mm or 44 mm
Panel: LTPO OLED
Peak brightness: 1,000 nits
Always-on display: No
Display detail: Retina LTPO OLED with Force Touch; 40mm 324 x 394 pixels and 759 sq mm; 44mm 368 x 448 pixels and 977 sq mm; display wakes by wrist raise (PhoneArena)

Health and fitness

ECG: Yes
Blood oxygen: No
Skin temperature: No
Sleep apnoea alerts: No
High blood pressure alerts: No
Body composition: No
Fall detection: Yes
Crash detection: No
GPS: Single-band
Water resistance: 50 m
Sensors: Electrical and optical heart sensors; barometric altimeter; accelerometer up to 32 g-forces, improved gyroscope and ambient light sensor
Health features: ECG capability, high and low heart-rate alerts and irregular-rhythm notifications; ECG app was not available at hardware launch and reached the UK in March 2019
Fitness features: GPS, GLONASS, Galileo and QZSS; swimming, yoga and hiking workouts, automatic workout reminders, cadence, pace alerts and rolling mile pace in watchOS 5; GymKit
Safety features: Hard-fall detection can call emergency services after immobility and notify emergency contacts; Emergency SOS

Battery and connections

Battery life (maker's claim): Up to 18 hours
Mobile data option: Yes
Works with: iPhone
Chip: S4
Storage: 16 GB
Battery life detail: Built-in rechargeable lithium-ion battery
Charging: Magnetic charging cable and USB power adapter
Connectivity: W3 wireless chip; Wi-Fi 802.11b/g/n at 2.4GHz; Bluetooth 5.0; cellular versions add LTE and UMTS with a compatible plan; GPS requires iPhone 5s, cellular iPhone 6, both with iOS 12 at launch

Design

Weight (lightest version): 30.1 g
Software: watchOS
Case materials: Aluminium or stainless steel case; ceramic and sapphire crystal back; water resistance under ISO 22810:2010 for shallow-water swimming
Size: 40mm 40 x 34 x 10.7 mm, 30.1 g aluminium or 39.8 g steel; 44mm 44 x 38 x 10.7 mm, 36.7 g aluminium or 47.9 g steel; weights exclude bands
Bands: Compatible with earlier Apple Watch bands of the corresponding size; Nike+ includes Nike bands and watch faces; Hermès includes leather bands and exclusive faces. Nike+ became available 5 October 2018
Colours: Silver, Space Grey and Gold aluminium; Silver, Space Black (DLC) and Gold (PVD) stainless steel; Nike+ Silver or Space Grey; Hermès polished stainless steel
In the box: Watch and band, magnetic charging cable and USB power adapter

Pros and cons

Pros

Larger display with thinner borders
ECG capability and fall detection
Cellular option and built-in GPS

Cons

No always-on display
Up to 18 hours of battery life
Works only with an iPhone

Closest rivals

Model	Type	Sizes	Movement	Power reserve	Display	Battery	Water	GPS	Weight	Released
AppleWatch Series 5	Smart and sports	40, 44 mm	–	–	LTPO OLED	18 h	50 m	Single-band	30.8 g	Sept 2019
AppleWatch SE (1st generation)	Smart and sports	40, 44 mm	–	–	LTPO OLED	18 h	50 m	Single-band	30.49 g	Sept 2020
AppleWatch Series 6	Smart and sports	40, 44 mm	–	–	LTPO OLED	18 h	50 m	Single-band	30.5 g	Sept 2020