• Lens Material - Corning® Gorilla® Glass DX
• Bezel Material - Fiber-reinforced polymer
• Quickfit Watch Band Compatible - yes (22 mm)
• Strap Material - Silicone
• Physical Size - 47 x 47 x 13.7 mm; Fits wrists with a circumference of 130-220 mm
• Display Size - 1.2" (30.4 mm) diameter
• Display Resolution - 240 x 240 pixels
• Display Type - Sunlight-visible, transflective memory-in-pixel (MIP)
• Weight - 50 grams
• Battery Life - Smartwatch Mode: Up to 2 weeks, GPS mode with music: Up to 10 hours, GPS mode without music: Up to 36 hours
• Water Rating - 5 ATM
• Color Display - Yes
• Memory/history - 200 hours of activity data

Clock Features

• Time/date - Yes
• GPS Time Sync - Yes
• Automatic daylight saving time - Yes
• Alarm clock - Yes
• Timer - Yes
• Stopwatch - Yes
• Sunrise/sunset times - Yes

Sensors

• GPS - Yes
• GLONASS - Yes
• Galileo - Yes
• Garmin Elevate™ wrist heart rate monitor - Yes
• Barometric altimeter - Yes
• Compass - Yes
• Gyroscope - Yes
• Accelerometer - Yes
• Thermometer - Yes
• Pulse Ox - Yes

Daily Smart Features

• Connect IQ™ (downloadable watch faces, data fields, widgets and apps) - yes
• Smart notifications - yes
• Text response/reject phone call with text (Android™ only) - yes
• Connectivity - Bluetooth®, ANT+®, Wi-Fi®
• Calendar - yes
• Weather - yes
• Controls smartphone music - yes
• Plays and controls watch music - yes
• Music Storage - Up to 1000 songs
• Find My Phone - yes
• Find My Watch - yes
• VIRB® Remote - yes
• Smartphone compatibility - iPhone®, Android™
• Compatible with Garmin Connect™ Mobile - yes
• Garmin Pay™ - yes

Safety and Tracking Features

• LiveTrack - yes
• Group LiveTrack - yes
• Live Event Sharing - Android™ Only
• Incident Detection during select activities - yes (Smartphone Required)
• Assistance - yes (Smartphone Required)

Tactical Features

• Dual grid coordinates - yes

Activity Tracking Features

• Step counter - yes
• Move bar (displays on device after a period of inactivity; walk for a couple of minutes to reset it) - yes
• Auto goal (learns your activity level and assigns a daily step goal) - yes
• Sleep monitoring (monitors total sleep and periods of movement or restful sleep)  - yes
• Calories burned - yes
• Floors climbed - yes
• Distance traveled - yes
• Intensity minutes - yes
• TrueUp™ - yes
• Move IQ™ - yes
• Fitness Age - yes (in app)
• Body Battery™ Energy Monitor - yes
• All-day Stress Tracking - yes

Gym & Fitness Equipment

• Available gym activity profiles - Strength, Cardio and Elliptical Training, Stair Stepping, Indoor Rowing and Yoga
• Cardio workouts - yes
• Strength workouts - yes
• Automatic rep counting - yes

Training, Planning and Analysis Features

• GPS speed and distance - yes
• Customizable data pages - yes
• Customizable activity profiles - yes
• Auto Pause® - yes
• Interval training - yes
• Advanced workouts - yes
• Downloadable training plans - yes
• Auto Lap® - yes
• Manual lap - yes
• Configurable lap alerts - yes
• Heat and altitude acclimation - yes
• V02 max - yes
• Training Status (lets you see if you’re training effectively by tracking your training history and fitness level trend.) - yes
• Training Load (your total training load for the last 7 days calculated from estimated EPOC) - yes
• Training load focus - yes
• Training Effect - yes
• Training Effect (anaerobic) - yes
• Primary benefit (Training Effect labels) - yes
• Custom alerts - yes
• Audio prompts - yes
• Finish time - yes
• Virtual Partner - yes
• Race and Activity - yes
• Auto multisport activities - yes
• Manual multisport activities - yes
• Course guidance - yes
• Garmin Live Segments - yes
• Strava Live Segments - yes
• Round-trip course creator (running/cycling) - yes
• Trendline™ Popularity Routing - yes
• Touch and/or button lock - yes
• Hot keys - yes
• Auto scroll - yes
• Activity history on watch - yes
• Physio TrueUp - yes

Heart Rate Feature

• HR zones - yes
• HR alerts - yes
• HR calories - yes
• % HR max - yes
• % HRR - yes
• Recovery time - yes
• Auto max HR - yes
• HRV stress test (measures your heart rate variability while standing still, for 3 minutes, to provide you with an estimated stress level; the scale of this is 1 to 100; low scores indicate lower stress levels) - yes (with compatible accessory)
• HR Broadcast (broadcasts HR data over ANT+™ to paired devices) - yes
• Respiration rate (during exercise) - yes (with compatible accessory)

Running Features

• Available run profiles - yes
• Running, Indoor Track Running, Treadmill Running, Trail Running - yes
• GPS-based distance, time and pace - yes
• Running dynamics - yes (with compatible accessory)
• Vertical oscillation and ratio (the degree of 'bounce' in your running motion and the cost-benefit ratio with stride length) - yes (with compatible accessory)
• Ground contact time and balance (shows how much time, in the running motion, your foot is on the ground rather than in flight and lets you check your running symmetry) - yes (with compatible accessory)
• Stride length (real time) - yes (with compatible accessory)
• Cadence (provides real-time number of steps per minute) - yes
• Performance condition (after running 6–20 minutes, compares your real-time condition to your average fitness level) - yes
• Lactate threshold (through analysis of your pace and heart rate, estimates the point where your muscles start to rapidly fatigue) - yes (with compatible accessory)
• Run workouts - yes
• Race predictor - yes
• Foot pod capable - yes

Cycling Feature

• Alerts (triggers alarm when you reach goals including time, distance, heart rate or calories) - yes
• Courses - yes
• Cycle Map (routable cycling-specific street map) - yes
• Available cycling profiles - Biking, Indoor Biking, Mountain Biking
• Bike lap and lap maximum power (with power sensor) - yes
• Race an activity - yes
• FTP (Functional Threshold Power) - yes (with compatible accessory)
• Compatible with Vector™ (power meter) - yes
• Power meter compatible - yes
• Advanced Vector support - yes
• Compatible with Varia Vision™ (head-mounted display) - yes
• Compatible with Varia™ radar (rear-facing radar) - yes
• Compatible with Varia™ lights - yes
• Speed and cadence sensor support (with sensor) - yes

Swimming Features

• Available swim profiles - Pool Swimming, Open Water Swimming
• Open-water swim metrics (distance, pace, stroke count/rate, stroke distance, swim efficiency (SWOLF), calories) - yes
• Pool swim metrics (lengths, distance, pace, stroke count, swim efficiency (SWOLF), calories) - yes
• Stroke type detection (freestyle, backstroke, breaststroke, butterfly) (pool swim only) - yes
• Drill logging (pool swim only) - yes
• Basic rest timer (up from 0) (pool swim only) - yes
• "Repeat on" rest timer (pool swim only) - yes
• Countdown start (pool swim only) - yes
• Pool swim workouts - yes 
• Heart rate from external HRM (real-time during rests, interval and session stats during rests, and automatic heart rate download post-swim) - yes (with HRM-Tri™ and HRM-Swim™)

In the Box

• Forerunner 945 GPS watch
• 1 extra set bands (black)
• HRM-Tri Monitor
• HRM-Swim Monitor
• Quick Release Kit
• Charging cable
• Documentation