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General| Display Size | 1.2" (30.4 mm) diameter |
|---|---|
| Display Resolution | 240 x 240 pixels |
| Weight | 42.2 g |
| Water Rating | 5 ATM |
| GPS | Yes |
| Heart Rate Monitor | Yes |
| Music Storage | Up to 500 songs |
| Display Type | Sunlight-visible, transflective memory-in-pixel (MIP) |
| Lens Material | Chemically strengthened glass |
| Bezel Material | Stainless steel |
| Case Material | Fiber-reinforced polymer |
| Strap Material | Silicone |
| Memory/History | 200 hours of activity data |
| Connectivity | Bluetooth, ANT+, Wi-Fi |
| Notifications | Yes |
| Music | Yes |
| Garmin Pay | Yes |
| Sensors | GPS, GLONASS, Galileo, heart rate monitor, accelerometer, thermometer, compass, gyroscope |
| Compatibility | iOS and Android |
| Sports Apps | Running, Cycling, Swimming, Strength Training, Cardio Training, Elliptical Training, Floor Climbing, Yoga |
| Color Options | Black, Sandstone |
| Battery Life | Up to 7 days in smartwatch mode, 5 hours in GPS mode with music |
Instructions for initiating a timed activity on the device.
Information specific to using the device for swimming activities.
Creating and using custom workouts with goals for steps, distance, time, or calories.
Creating and performing interval training sessions.
Automatically tracks sleep duration, levels, and movement.
Explains how the device tracks moderate to vigorous intensity activity minutes.
Information about the device's built-in heart rate monitor.
How to use running dynamics metrics with compatible accessories.
Understanding how training impacts fitness and performance levels.
Estimating VO2 max. as an indicator of aerobic fitness.
Estimating the time needed for full recovery before the next hard workout.
Determining the point at which muscles fatigue rapidly during exercise.
Overview of features that connect to a smartphone via Bluetooth.
How to add custom features like watch faces, data fields, widgets, and apps.
How to play music stored on the Forerunner 645 Music.
Using the device to control music playback on a smartphone.
How to set up a Garmin Pay wallet and add payment cards.
Steps to make contactless payments using the watch.
Connecting external sensors like heart rate monitors or foot pods.
Instructions on how to charge the device.
Guidelines for maintaining and protecting the device.
Instructions on how to clean the device properly.
Tips for extending the device's battery life.
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