Apple Watch S9 41mm Mid Alu Midnight Sports Band

Features & Compatibility

Size and Weight

41mm
Height: 41mm
Width: 35mm
Depth: 10.7mm
Weight (aluminum, GPS): 31.9 grams
Weight (aluminum, GPS + Cellular): 32.1 grams
Weight (stainless steel): 42.3 grams
Fits 130–200mm wrists

Hardware and Buttons

Digital Crown
Microphone
Side button
Electrical heart sensor
Speaker/air vent
Optical heart sensor

Controls

Digital Crown with haptic feedback
Side button
Double tap gesture
Siri with on‑device processing

Chip

S9 SiP with 64‑bit dual‑core processor
4‑core Neural Engine
64GB capacity

Sensors

Electrical heart sensor
Third‑generation optical heart sensor
Temperature sensing¹
Compass
Always‑on altimeter
High‑g accelerometer
High dynamic range gyroscope
Ambient light sensor

Health and Wellness

ECG app²
Cycle Tracking app with retrospective ovulation estimates³
Heart Rate app
High and low heart rate notifications
Irregular rhythm notifications⁴
Medications app
Mindfulness app
Noise app
Sleep app including sleep stages

Display

Always‑On Retina LTPO OLED display
Edge‑to‑edge display
Ion‑X front glass (aluminum cases)
Sapphire front crystal (stainless steel cases)
Up to 2000 nits maximum brightness
1 nit minimum brightness
326 pixels per inch

Power and Battery Life

All‑day battery life, up to 18 hours of normal use⁵
Up to 36 hours in Low Power Mode⁵
Built‑in rechargeable lithium‑ion battery
Fast‑charge capable⁶
Up to 80% charge in about 45 minutes⁶

Learn more about Power and Battery Life

Operating System

watchOS

watchOS is the world’s most advanced wearable operating system, with apps and features designed to keep you active, healthy, safe, and connected.

Learn more about watchOS

Workouts and Activity

Running
Custom interval workouts
Customizable Workout Views
Heart Rate Zones
Race Route
Stride length, ground contact time, and vertical oscillation
Automatic track detection
Multisport workout

Hiking
Bearing, incline, elevation, and coordinates
Custom waypoints
Automatically generated waypoints to cellular connectivity
Backtrack GPS data
Topographic maps for over 1000 national and regional parks (U.S. only)

Cycling
Average speed, elevation gained, and distance
Connection to cycling accessories via Bluetooth
Functional Threshold Power
Power Zones
Cadence
Live Activity on iPhone

Swimming
Pool swim or open water swim
Splits and auto sets
SWOLF score
Automatic stroke detection
Kickboard
Average pace, total distance, and laps

More Workouts

Walk
Elliptical
Rower
Stair Stepper
HIIT
Yoga
Functional Strength Training
Dance
Cooldown
Core Training
Pilates
Tai Chi
Wheelchair
Kickboxing
Multisport
Other

Safety

Emergency SOS⁷
International emergency calling⁸
Crash Detection⁷
Fall Detection

Durability

Water resistance 50m (swimproof)⁹
Dust resistance IP6X¹⁰

Connectivity

L1 GPS, GNSS, Galileo, and BeiDou
LTE and UMTS¹¹
Wi‑Fi 4 (802.11n)
Bluetooth 5.3
Second‑generation Ultra Wideband chip¹²
Apple Pay
GymKit
Supports Apple Watch for kids using Family Setup¹³