Apple Watch Ultra 4 MJA84LS/A, 49mm
Apple Watch Ultra 4 is a 49mm titanium smartwatch with sapphire crystal, 100m water resistance, dual-frequency GPS and cellular connectivity.
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About this item
- Up to 45 hours of Max Extended Workout tracking, with fast charging to 18 hours of use in 15 minutes
- Heart rate sensing with HRV readings as often as every five minutes for stress and recovery insights
- Vitals app, daily sleep score, cycle tracking and blood oxygen readings for a full health picture
- Precision dual-frequency GPS, Pacer, Heart Rate Zones, Custom Workouts and training load
- Tough titanium case with sapphire crystal display, water resistant up to 100m
- Fall and crash detection, plus satellite communications to text emergency services without cell service
Top Highlights
- Brand
- Apple Watch
- Model Name
- Ultra 4 GPS + Cellular
- Model Number
- MJA84LS/A
- Department
- Unisex
- Item Type
- Smart Watch
- Manufacturer
- Apple
- First Available
- September 8, 2026
Features & Specs
- Display
- Digital
- Case Material
- Titanium
- Case Size
- 49 mm
- Weight
- 439.4 g
- Water Resistance
- 100 m
- Crystal
- Sapphire crystal
- Dimensions
- 8.43 x 4.65 x 1.5 inches
Style
- Dial Shape
- Rectangle
- Collection
- Ultra
Description
Apple Watch Ultra 4 GPS + Cellular is built for runners, triathletes, swimmers and anyone who trains outdoors. It pairs a 49mm case with a large display and a focus on endurance, health tracking and safety features.
The case is made of titanium and the display is protected by sapphire crystal. Water resistance is rated to 100m, and precision dual-frequency GPS handles distance tracking. Cellular lets you make calls and stream music without your iPhone nearby.
Battery stamina is the headline: up to 45 hours in Max Extended Workout mode, with fast charging that delivers up to 18 hours of use in 15 minutes. Fall detection, crash detection and satellite messaging for emergencies add a layer of safety for remote training days.
Frequently Asked Questions
Can I swim with the Apple Watch Ultra 4?
Yes for pool and open-water swimming. The Apple Watch Ultra 4 is rated water resistant to 100m, and Apple positions it for swimmers, divers and fans of high-speed water sports. It suits daily swim sessions and showers without trouble.
How long does the battery last on a long workout?
The Apple Watch Ultra 4 offers up to 45 hours in Max Extended Workout mode, which suits ultramarathons and long outdoor days. Fast charging gives up to 18 hours of use from a 15-minute top-up, so a short break is usually enough between sessions.
Will it fit a smaller wrist?
The case measures 49mm, which is large and sits prominently on the wrist. Smaller wrists may find the Apple Watch Ultra 4 bulky for all-day wear. If you are unsure, compare it with a smaller smartwatch before choosing, as the wrist fit is the main practical concern.
Does it work without my iPhone nearby?
This GPS + Cellular version can make and take calls and stream music and podcasts without your iPhone, and it can pair with AirPods. If you have no cell service or Wi-Fi, built-in satellite communications let you text emergency services.
What makes it different from a standard sports GPS watch?
Compared with a dedicated sports watch, the Apple Watch Ultra 4 adds cellular calling, Siri AI, satellite messaging and a full health suite alongside dual-frequency GPS. A sport-only GPS watch may last longer between charges, so choose by whether you value smart features or sheer battery life.
Which health and safety features does it include?
The Apple Watch Ultra 4 measures heart rate and HRV, blood oxygen, sleep score and cycle tracking, and gives a daily readiness score. For safety, it can detect a hard fall or severe car crash. Service at an Apple center handles any battery needs.
Editor's take
Apple Watch Ultra 4 sits at the top of Apple's wearable range and speaks to endurance athletes first: runners, triathletes and open-water swimmers who want one device for training and recovery. The 49mm case is large by design, and it is the platform for a long list of sports and health features.
The titanium case and sapphire crystal display are the right materials for a watch meant to be abused outdoors, keeping weight reasonable while resisting scratches. Precision dual-frequency GPS is the feature that matters most for distance work, and the 100m water resistance covers swimming and water sports. Battery life of up to 45 hours in Max Extended Workout mode, with fast charging to 18 hours in 15 minutes, stretches well beyond a typical smartwatch day.
The trade-off is size and character. A 49mm case will overwhelm smaller wrists, and as a smartwatch it still needs regular charging, unlike a mechanical or quartz watch. Anyone who wants a dressy, slim profile or a multi-week battery should look at a conventional dive or field watch instead.
It suits athletes and adventurers who want satellite communications, fall and crash detection, and a deep health suite on the wrist. For similar money, a dedicated sports GPS watch is the alternative, though it will not match the cellular and Siri features here.
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