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Apple Watch Series 4 Stainless Steel

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Specifications

Certified Quality & Packaging

Apple Watch Series 4 Stainless Steel

Quick Facts

Item

Details

Launch Year

2018

Case Material

Stainless Steel

Available Sizes

40mm, 44mm

Display

LTPO OLED Retina Display (324 × 394 / 368 × 448)

Processor

Apple S4 SiP

Connectivity

GPS + Cellular

Battery Life

Up to 18 hours

Water Resistance

50m (WR50)

Health Features

Heart Rate, ECG, Fall Detection

Glass

Sapphire Crystal

Storage

16GB

Weight

40.6g (40mm), 47.8g (44mm)

Compatibility

iPhone only

Overview

The Apple Watch Series 4 Stainless Steel is designed for iPhone users who want a more premium Apple Watch with a polished stainless steel finish and enhanced durability. Compared to the Aluminium model, it features Sapphire Crystal glass, which offers better scratch resistance for everyday wear.

Powered by the Apple S4 SiP, it includes a bright Retina display, ECG, Fall Detection, built-in GPS + Cellular connectivity, up to 18 hours of battery life and 50m water resistance. When buying a used Apple Watch, check the battery condition, Activation Lock status, Sapphire Crystal glass, and overall condition before making your purchase.

Key Highlights

1. Premium Stainless Steel Design

The polished stainless steel case gives the watch a more premium appearance and improved durability compared to the Aluminium model.

Why it matters

  • Premium polished finish

  • Better resistance to dents

  • Ideal for both casual and formal wear

2. Sapphire Crystal Display

Unlike the Aluminium version, the Stainless Steel model uses Sapphire Crystal glass, which is significantly more resistant to scratches.

Why it matters

  • Better scratch resistance

  • Suitable for daily wear

  • Helps maintain resale value

3. Built-in GPS + Cellular

The Stainless Steel version comes with GPS + Cellular as standard, allowing you to stay connected without your iPhone nearby.

Why it matters

  • Make calls without your iPhone

  • Send messages on the go

  • Stream music with a supported mobile plan

Key Features Explained

Feature

Specification

Why It Matters

Display

LTPO OLED Retina Display

Bright and easy to read indoors and outdoors

Processor

Apple S4 SiP

Smooth everyday performance

Battery Life

Up to 18 hours

Suitable for a full day’s typical use

Charging

Magnetic Charging Cable

Simple and convenient charging

Water Resistance

50m (WR50)

Suitable for swimming but not diving

Connectivity

GPS + Cellular

Stay connected even without your iPhone nearby

Health Features

Heart Rate, ECG, Fall Detection

Supports health monitoring and safety features

Glass

Sapphire Crystal

More scratch resistant than Ion-X glass

Case Material

Stainless Steel

Premium finish with added durability

Compatibility

iPhone only

Apple Watch is not compatible with Android phones

GPS + Cellular

Unlike the Aluminium version, the Apple Watch Series 4 Stainless Steel is available with GPS + Cellular as standard.

With a supported carrier and mobile plan, you can:

  • Make and receive phone calls

  • Send and receive messages

  • Stream Apple Music

  • Receive notifications

  • Stay connected even when your iPhone is not nearby

If you normally leave your phone behind during workouts or commuting, GPS + Cellular offers greater flexibility.

Compare the Related Models

Feature

Apple Watch Series 3 Stainless Steel

Apple Watch Series 4 Stainless Steel

Apple Watch Series 5 Stainless Steel

Apple Watch Series 6 Stainless Steel

Launch Year

2017

2018

2019

2020

Display

OLED Retina

LTPO OLED Retina

Always-On LTPO OLED Retina

Always-On LTPO OLED Retina

Processor

Apple S3

Apple S4

Apple S5

Apple S6

Health Features

Heart Rate

Heart Rate, ECG, Fall Detection

Heart Rate, ECG, Fall Detection

ECG, Blood Oxygen, Fall Detection

Battery Life

Up to 18 hours

Up to 18 hours

Up to 18 hours

Up to 18 hours

Storage

16GB

16GB

32GB

32GB

Water Resistance

50m

50m

50m

50m

Connectivity

GPS + Cellular

GPS + Cellular

GPS + Cellular

GPS + Cellular

Glass

Sapphire Crystal

Sapphire Crystal

Sapphire Crystal

Sapphire Crystal

Weight

42.4g / 52.8g

40.6g / 47.8g

40.6g / 47.8g

39.7g / 47.1g

Which Apple Watch Should You Choose?

Model

Recommended For

Apple Watch Series 4 Stainless Steel

Buyers who want Sapphire Crystal glass and premium build quality at an affordable price.

Apple Watch Series 5 Stainless Steel

Buyers who want an Always-On Display.

Apple Watch Series 6 Stainless Steel

Buyers who want Blood Oxygen monitoring and a faster processor.

Apple Watch Series 3 Stainless Steel

Buyers looking for a lower-cost premium Apple Watch.

Alternatives to Apple Watch Series 4 Stainless Steel

If you’re comparing before buying, you may also want to check these related SellUp Marketplace pages:

Common Questions

Is the Apple Watch Series 4 Stainless Steel still worth buying?

Yes. It remains a great choice for buyers who prefer a premium Apple Watch with Sapphire Crystal glass, ECG, Fall Detection and GPS + Cellular connectivity. When buying used, check the battery condition, Activation Lock status and overall condition.

What is the difference between the Stainless Steel and Aluminium models?

The Stainless Steel model includes Sapphire Crystal glass, GPS + Cellular as standard and a heavier premium case. The Aluminium model uses Ion-X glass, is lighter and is available in both GPS and GPS + Cellular versions.

Is the Apple Watch Series 4 Stainless Steel waterproof?

The Apple Watch Series 4 Stainless Steel has a 50m (WR50) water resistance rating, making it suitable for swimming. It is not designed for diving or high-pressure water sports. Water resistance may reduce over time on used devices.

Is the Apple Watch Series 4 Stainless Steel better than the Apple Watch Series 5 Stainless Steel?

The Series 5 adds an Always-On Display, built-in compass and 32GB of storage. If you want the best value in a premium Apple Watch, the Series 4 Stainless Steel remains an excellent choice. If an Always-On Display is important, the Series 5 is worth the upgrade.

Why Buy the Apple Watch Series 4 Stainless Steel?

The Apple Watch Series 4 Stainless Steel combines a premium stainless steel case, Sapphire Crystal glass, ECG, Fall Detection and GPS + Cellular connectivity, making it an excellent choice for buyers seeking a high-end Apple Watch at a more affordable used price. Compare Apple Watch Series 4 Stainless Steel listings on SellUp Marketplace to find the case size, condition and price that best suit your budget.