Garmin Forerunner 645 Music, Slate

Last updated: March 12, 2021


This is a smartwatch that can store and play back up to 500 songs without a phone, all while dynamically monitoring your heart rate and running technique. The performance features on this watch‚ including contactless pay and an easy-to-use interface, create a unique sense of freedom.

Garmin Forerunner 645 Music, Slate

We looked at the top Garmin Watches and dug through the reviews from some of the most popular review sites. Through this analysis, we've determined the best Garmin Watch you should buy.

Product Details

Key Takeaway: This smartwatch is great for tracking and improving your running routine, and it won’t be out of place in your day-to-day life.

In our analysis of 8 expert reviews, the Garmin Forerunner 645 Music, Slate placed 3rd when we looked at the top 6 products in the category. For the full ranking, see below.

From The Manufacturer

Easily download up to 500 songs to your watch, and connect with Bluetooth headphones (sold separately) for phone free listening. Syncs music from select streaming services for offline listening. Fits wrists with a circumference of 127-204 millimeter. Display size – 1.2 inch (30.4 millimmeter) diameter. Garmin Pay contactless payment solution lets you make convenient payments with your watch, so you can leave your cash and cards at home. Uses wrist based heart rate to offer performance monitoring Features, including evaluating your current training status. Battery life: Up to 7 days in Smartwatch mode; 5 hours in GPS mode with music. Strap material: Silicone. Display resolution: 240 x 240 pixels. Display type :sunlight-visible, transflective memory-in-pixel (MIP).

Expert Reviews


What reviewers liked

The Forerunner 645 Music is a watch that can track a huge variety of sports and look good while doing it.

What reviewers didn't like

The headline music playback feature feels a bit half-baked and the battery life isn't as good as we've experienced on other Garmin watches.
View our Garmin Watch buying guide for in-depth advice and recommendations.

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