Forerunner 645

GPS Running Watch with Contactless Payments and Wrist-based Heart Rate
Garmin Pay™ contactless payment solution¹ lets you make convenient payments with your watch, so you can leave your cash and cards at home
Provides advanced running dynamics², including ground contact time balance, stride length, vertical ratio and more
Uses wrist-based heart rate³ to offer performance monitoring features, including evaluating your current training status
Connected features4 include smart notifications, automatic uploads to Garmin Connect™ and the ability for others to track your runs with the LiveTrack feature
Customize with free watch faces, apps and more from our Connect IQ™ store
Battery life5: up to 7 days in smartwatch mode; 14 hours in GPS mode.

In the box
• Forerunner 645
• Charging cable
• Documentation

Specifications
• Lens Material: chemically strengthened glass
• Bezel Material: stainless steel
• Quick Release Bands: yes (20 mm, Industry standard)
• Strap material: silicone
• Physical size: 42.5 x 42.5 x 13.5 mm
Fits wrists with a circumference of 127-204 mm
• Weight: 41.8 g
• Water rating: 5 ATM
• Display type: sunlight-visible, transflective memory-in-pixel (MIP)
• Display size: 1.2" (30.4 mm) diameter
• Display resolution: 240 x 240 pixels
• Color display
• Battery life: Smartwatch Mode: Up to 7 days
• GPS mode: Up to 14 hours
• Memory/History: 200 hours of activity data

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

Sensors
• GPS
• GLONASS
• Garmin Elevate™ wrist heart rate monitor
• Barometric altimeter
• Compass
• Gyroscope
• Accelerometer
• Thermometer

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

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

Fitness Equipment/Gym
• Preloaded gym activity profiles: Strength Training, Cardio Training, Elliptical Training, Stair Stepping, Floor Climbing, Indoor Rowing and Yoga
• Cardio workouts
• Strength workouts
• Automatic rep counting

Training, Planning and Analysis Features
• GPS speed and distance
• Customizable data pages
• Customizable activity profiles
• Auto Pause®
• Interval training
• Advanced workouts
• Downloadable training plans
• Auto Lap®
• Manual lap
• Configurable lap alerts
• V02 max
• Training Status (lets you see if you’re training effectively by tracking your training history and fitness level trend.)
• Training Load (your total training load for the last 7 days calculated from estimated EPOC)
• Training Effect (aerobic)
• Training Effect (anaerobic)
• Customizable alerts
• Audio prompts
• Finish time
• Virtual Partner
• Race an Activity
• Course guidance
• Segments (Live, Garmin)
• Strava features (Beacon, live segments)
• LiveTrack
• Touch and/or button lock
• Auto scroll
• Activity history on watch

Heart Rate Features
• HR zones
• HR alerts
• HR calories
• % HR max
• % HRR
• Recovery time
• Auto max HR
• HR Broadcast (broadcasts HR data over ANT+™ to paired devices)

Running Features
• Preloaded run profiles
• Running, Treadmill Running, Indoor Track
• GPS-based distance, time and pace
• Running dynamics
• Cadence (provides real-time number of steps per minute)
• Performance condition (after running 6–20 minutes, compares your real-time condition to your average fitness level)
• Run workouts
• Race predictor
• Foot pod capable

Outdoor Recreation Features
• Preloaded outdoor recreation profiles
• Skiing, Snowboarding, XC Skiing, Stand up Paddleboarding, Rowing
• Point-to-point navigation
• Bread crumb trail in real time
• Back to start
• TracBack®
• UltraTrac mode
• Elevation profile
• Distance to destination
• Vertical speed
• Total ascent/descent
• GPS coordinates

Cycling Features
• Preloaded cycling profiles
• Biking, Indoor Biking
• Courses
• Race an activity
• Time/distance alerts (triggers alarm when you reach goal)
• Compatible with Varia Vision™ (head-mounted display)
• Compatible with Varia™ radar (rear-facing radar)
• Compatible with Varia™ lights
• Speed and cadence sensor support (with sensor): yes (ANT+® and Bluetooth® Smart)

Swimming Features
• Preloaded swim profiles
• Pool Swimming
• Pool swim metrics (lengths, distance, pace, stroke count/rate, calories)
• Stroke type detection (freestyle, backstroke, breaststroke, butterfly)
• Swim efficiency (SWOLF)
• Drill logging
• Pool swim workouts