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Apple Watch Series 4 "40 mm" Cellular(US/CA) Specs

Apple Watch Series 4 - MTUD2LL/A - Watch4,3 - A1975

About This Watch

The Apple Watch Series 4 is very similar to previous devices in its line-up but features larger screens as well as a few upgraded components which improve the functionality and features of the watch. The Series 4 has larger screen sizes of 40 mm and 44 mm which allows for more internal space inside the watch and more screen area for apps to use. This model has cellular capabilities allowing it to function without being tethered to an iPhone.

Apple decided to focus on health with this device. This was emphasised by the new accelerometer and gyroscope which are used to detect when a user has a fall. The heart rate monitor already tracks sudden spikes or irregular patterns and warns users of the risk of a stroke. Apple introduced an electrical heart sensor(ECG) into the Series 4 watch. This single pulse electrical heart sensor is able to detect signs of atrial fibrillation and alter the user.

Storage & Memory

The Apple Watch Series 4 comes with 1 GB of RAM and 16 GB of memory.



Screen Size and Resolution

This Apple Watch Series 4 has a 40 mm sized OLED display with strengthened Ion-X glass and a resolution of 324×394. This display is force touch capable and also has a water resistance protection of an estimated 50 meters.



Inclusive Features

The Apple Watch includes the following features:

  • Force touch OLED display
  • Digital crown control piece
  • Multiple wristband units
  • Heart-rate monitor
  • Electrical heart sensor (ECG)
  • Emergency heart-rate detection
  • Wireless Charging
  • Bluetooth
  • Water resistant
  • GPS tracker
  • LTE




The Apple Watch Series 4 comes with Apple watchOS 5 for its operating system. It is also powered by a dual-core Apple S4 processor. Apple has not released processing speeds for this processor.



The Apple Watch Series 4 battery is expected to go for up to 18 hours overall but specifically 2 hours of talk time, 10 hours of audio, and up to 6 hours of working out while using GPS. There is no substantial improvement from the Apple Watch 3 on battery life.

Apple S4

1 GB

16 GB Flash Storage

18 Hours

Introduction Date: September 12, 2018

Discontinued Date: September 10, 2019




1 (2 cores)

Onboard RAM

1 GB

Processor Speed



Processor Type

Apple S4


16 GB

Connectivity Details

Song Capacity


USB Support


Photo Capacity


FireWire Support



Standard Wireless

802.11b/g/n 2.4 GHz

Case Type


Standard Bluetooth


Form Factor

Apple Watch Series 4 (40 mm)

Cell Network


Housing Color


Battery Details


Digital Crown

Battery Type

Lithium Ion

Apple Order Number


Battery Life

2 – 18 hours

Apple Subfamily

Watch Series 4 40mm

Standby Time


Apple Model Number

A1975 (EMC 3227)

Operating System and Display

Model ID

Watch 4.3

Pre-installed OS

watchOS 5.0 (16R364)



Maximum OS

Current OS



Built-in Display

1.8  OLED

Average Weight

1.06/1.40 oz. (30.1g/39.8)

Display Resolution


Minimum iPhone Support

iPhone 5

Refurbished Macbook Pro

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