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    Forerunner 645 Music
    The Garmin Forerunner 645 Music is a smartwatch with a 1.3-inch color LCD display, compatible with iOS and Android and includes step counting, sleep tracking, and calories burned.
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    Description
    The Garmin Forerunner 645 Music is a smartwatch with a 1.3-inch color LCD display, compatible with iOS and Android and includes step counting, sleep tracking, and calories burned.
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    We investigate, research and test so you can choose with confidence.

    Become a member to compare products & get access to ratings.

    We investigate, research and test so you can choose with confidence.

    Become a member to compare products & get access to ratings.

    We investigate, research and test so you can choose with confidence.

    CR Expert Take

    How did it perform in our expert lab testing?

    Overall Score

    The Overall Score for this model is derived from our expert lab test results.
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    Current Range of Tested Smartwatches
    What goes into the Overall Score?
    Ease of use
     /  5
    Versatility
     /  5
    Health
     /  5
    Step-count performance
     /  5
    Heart-rate performance
     /  5
    Scratch test
     /  5
    Water resistance test
     /  5
    Ease of interaction
     /  5
    Readability in bright light
     /  5
    Readability in low light
     /  5
    Ease of pairing
     /  5
    Heart-rate monitor accuracy
     /  5
    Step count accuracy
     /  5
    Color
     /  5

    Detailed Test Results

    Overall this model was somewhat easy to use, somewhat accurate for counting steps, and very good at measuring heart-rate accuracy. With recent version smartphones, our experts found it very easy to pair, somewhat difficult to interact with, and very easy to connect to charger. The watch face was very good in our scratch resistance hardness test. In our water immersion test it passed the manufacturer's claim of 164 feet for 10 minutes.

    About

    The Garmin Forerunner 645 Music is a smartwatch compatible with iOS and Android and includes real-time heart-rate monitor, steps, sleep, and calories. It has 240 x 240 screen resolution and an always-on display capability. It has an on-screen battery indicator, phone notifications and vibration alerts, and can dismiss calls from the watch. It includes inactivity alerts that remind you to move if you are sitting for a long time. It has a find my phone and find my watch feature, can control playback of music stored on your smartphone and can control playback of music stored on your watch. Has WiFi, GPS and NFC. The manufacturer offers changeable straps and has weather at-wrist. It can store music on the device and stream it to headphones wirelessly. However, to get music on the watch you have to connect using the included charging cable to your computer and you can't do it through the built-in app on your phone wirelessly. A strong feature that Garmin provides is the ability to interface with optional accessories like external heart-rate sensor chest straps, speed/cadence sensors, foot sensors, VIRB cameras, and others. It also has quick pin disconnect for replaceable watch straps. It has multi-sport tracking features: running, strength training, cardio training, elliptical training, stair stepping, floor climbing, Indoor rowing, yoga, golf, skiing, snowboarding, XC Skiing, paddle boarding, rowing, cycling, indoor biking, swimming, pool swimming metrics: lengths, distance, pace, stroke count/rate, calories, swimming stroke type detection for (freestyle, backstroke, breaststroke, butterfly), and swim efficiency (SWOLF). Its dimensions are 1.7 x 1.7 x 0.5 inches (LxWxD) and it weighs 1.5 ounces.

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