Apple MR9A3LW/A Watch Series 9 GPS 45mm Smartwatch Midnight — main product image

Apple MR9A3LW/A Watch Series 9 GPS 45mm Smartwatch Midnight

Apple

Apple MR9A3LW/A Watch Series 9 GPS 45mm Smartwatch Midnight

Name: Apple MR9A3LW/A Watch Series 9 GPS 45mm Smartwatch Midnight
Brand: Apple
SKU: MR9A3LW/A

★★★★★4.7 (8446 reviews)

Track your health, stay connected, and navigate your day with the S9-powered Apple Watch Series 9 in a durable 45mm design.

$318.00*$429.00Save 25%

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*Price sourced from Amazon.com. Last updated:Jun 27, 2026.Price and availability are subject to change.

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Overview

The Apple Watch Series 9 in 45mm Midnight builds on Apple's wearable platform with the new S9 SiP (System in Package), which brings a four-core Neural Engine capable of processing machine learning tasks directly on the watch. This translates into a display that reaches up to 2000 nits—double the brightness of the Series 8—making it far easier to read in harsh sunlight. The S9 chip also powers the double-tap gesture, a new interaction method that uses accelerometer data and optical sensors to detect when you tap your index finger and thumb together, letting you control the watch without touching the screen.

Health and safety remain central to the Series 9 experience. The electrical heart sensor delivers on-demand ECG readings, while irregular heart rhythm notifications run in the background. Temperature sensing supports cycle tracking and general wellness insights, and sleep tracking breaks your rest into REM, Core, and Deep stages. On the safety side, Fall Detection and Crash Detection can automatically contact emergency services, and Emergency SOS is available at the press of a button. The 45mm aluminum case in Midnight is crack-resistant, IP6X dust-certified, and swimproof to 50 meters, making it a durable daily companion for workouts, outdoor activities, and everyday wear.

Key Features

CARBON NEUTRAL — An aluminum Apple Watch Series 9 paired with the latest Sport Loop is carbon neutral. Learn more about Apple’s commitment to the environment at apple.com/2030.

WHY APPLE WATCH SERIES 9 — Your essential companion for a healthy life is now even more powerful. The S9 chip enables a superbright display and a magical new way to quickly and easily interact with your Apple Watch without touching the screen. Advanced health, safety, and activity features provide powerful insights and help when you need it. And redesigned apps in watchOS give you more information at a glance.

ADVANCED HEALTH FEATURES — Take an ECG anytime. Get notifications if you have an irregular heart rhythm. See how much time you spent in REM, Core, or Deep sleep with sleep stages. Temperature sensing provides insights into overall wellbeing and cycle tracking. And take note of your state of mind to help build emotional awareness and resilience.

A POWERFUL FITNESS PARTNER — The Workout app gives you a range of ways to train plus advanced metrics for more insights about your workout performance. And Apple Watch comes with three months of Apple Fitness+ free.

INNOVATIVE SAFETY FEATURES — Fall Detection and Crash Detection can connect you with emergency services in the event of a hard fall or a severe car crash. And Emergency SOS lets you call for help with the press of a button.

SIMPLY COMPATIBLE — It works seamlessly with your Apple devices and services. Unlock your Mac automatically. Get approximate distance and directions to your iPhone with Precision Finding on supported iPhone models. Pay and send money with Apple Pay. Apple Watch requires iPhone XS or later with the latest iOS version.

EASILY CUSTOMIZABLE — With watch bands in a range of styles, materials, and colors and fully customizable watch faces, you can change your watch to fit your mood or the moment.

INCREDIBLE DURABILITY — Tougher than tough. It’s crack resistant, IP6X-certified dust resistant, and swimproof with 50m water resistance.

STAY CONNECTED — Send a text, take a call, listen to music and podcasts, use Siri, and get notifications on the go. Apple Watch Series 9 (GPS) works with your iPhone or Wi-Fi to keep you connected.

LEGAL DISCLAIMERS — This is a summary of the main product features. See below to learn more.

Specifications

Case Size

45mm

Case Material

Aluminum

Color

Midnight

Chip

Apple S9 SiP

Display Brightness

Up to 2000 nits

Operating System

watchOS

Connectivity

GPS, Wi-Fi

Water Resistance

WR50 (50 meters)

Dust Resistance

IP6X certified

Battery Type

Lithium Ion

Compatibility

iPhone XS or later with latest iOS

Model Number

MR9A3LW/A

Pros & Cons

👍 Pros

S9 chip delivers a 2000-nit superbright display readable in direct sunlight
Double-tap gesture provides hands-free control without touching the screen
Comprehensive health suite includes ECG, blood oxygen, temperature sensing, and sleep stage tracking
Crack-resistant front crystal with IP6X dust and WR50 swim resistance
Carbon neutral when paired with select Sport Loop bands

👎 Cons

GPS-only model cannot make calls or send texts without a paired iPhone or Wi-Fi nearby
Battery life still requires daily charging for most users
Exclusive to iPhone—not compatible with Android devices
Always-on display and frequent sensor use can drain battery faster
45mm case size may feel bulky on smaller wrists

Frequently Asked Questions

Does the Apple Watch Series 9 GPS model require a cellular plan?

No. The GPS model connects through your paired iPhone or available Wi-Fi networks. You do not need a separate cellular plan.

What iPhone do I need to use this Apple Watch?

The Apple Watch Series 9 requires an iPhone XS or later running the latest version of iOS.

Is the Apple Watch Series 9 waterproof?

It is swimproof with WR50 water resistance (50 meters) and IP6X dust resistance, making it suitable for swimming and everyday exposure to water. It is not designed for scuba diving or high-velocity water activities.

What health sensors are included in the Series 9?

It includes an electrical heart sensor for ECG readings, an optical heart sensor, a blood oxygen sensor, and a temperature sensor for cycle tracking and wellness insights.

How does the double-tap gesture work?

The S9 chip enables a new double-tap gesture that lets you answer calls, stop timers, play or pause music, and more by tapping your index finger and thumb together—no screen touch needed.