Last Updated on March 28, 2020 by Jude Simeone
Garmin Forerunner 645 Full Specifications – The Forerunner 645 is a nice GPS smartwatch housed in a classic design and hosts a lot of features that include onboard music storage, NFC that supports Garmin Pay with Wi-Fi also available.
The Forerunner 645 comes in two versions; the standard 645 and 645 music. The difference between these two is the presence of significant storage space on the later which allows you to take your favorite tracks along with you. The Forerunner 645 like other Garmin smartwatches also has an impressive battery life.
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Garmin Forerunner 645/645 Music Full Specifications
| Garmin Forerunner 645 | Garmin Forerunner 645 Music | |||||||||||||||||||||||||
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EDITOR'S RATING |
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WHERE TO BUY | Check @ Amazon | Check @ Amazon | ||||||||||||||||||||||||
ABOUT DEVICE |
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| Device name | Garmin Forerunner 645 | Garmin Forerunner 645 Music | ||||||||||||||||||||||||
| Device type | Fitness/GPS smartwatch | Fitness/GPS smartwatch | ||||||||||||||||||||||||
| Predessesor | __ | __ | ||||||||||||||||||||||||
| Successor | -- | -- | ||||||||||||||||||||||||
| Released date | April, 2018 | April, 2018 | ||||||||||||||||||||||||
| Ideal for | Unisex | Unisex | ||||||||||||||||||||||||
DISPLAY |
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| Display type | Transflective memory-in-display (MIP) | Transflective memory-in-display (MIP) | ||||||||||||||||||||||||
| Display size | 1.2 inch | 1.2 inch | ||||||||||||||||||||||||
| Display resolution | 240 x 240 pixels | 240 x 240 pixels | ||||||||||||||||||||||||
| Pixel density | -- | -- | ||||||||||||||||||||||||
| Input type | 5 buttons, (not touchscreen) | 5 buttons, (not touchscreen) | ||||||||||||||||||||||||
| Always-on | Yes | Yes | ||||||||||||||||||||||||
BODY |
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| Shape | Circular | Circular | ||||||||||||||||||||||||
| Dimension | 42.5 x 42.5 x 13.5 mm | 42.5 x 42.5 x 13.5 mm | ||||||||||||||||||||||||
| Weight | 41.8 grams | 42.2 grams | ||||||||||||||||||||||||
| Casing material | Fiber-reinforced polymer | Fiber-reinforced polymer | ||||||||||||||||||||||||
| Strap/band material | Silicone | Silicone | ||||||||||||||||||||||||
| Bezel Material | Stainless steel | Stainless steel | ||||||||||||||||||||||||
| Strap size | 20mm | 20mm | ||||||||||||||||||||||||
| Screen protection | Corning Gorilla Glass 3 | Corning Gorilla Glass 3 | ||||||||||||||||||||||||
| Water resistant/Protection | Yes, 5ATM | Yes, 5ATM | ||||||||||||||||||||||||
| Swim-proof | Yes, recommended | Yes, recommended | ||||||||||||||||||||||||
| Color(s) | Black | Black | ||||||||||||||||||||||||
MEMORY |
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| RAM | -- | -- | ||||||||||||||||||||||||
| Internal storage | __ | 4GB | ||||||||||||||||||||||||
| Memory card slot | No | No | ||||||||||||||||||||||||
CONNECTIVITY |
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| Bluetooth | Yes, and ANT+ | Yes, and ANT+ | ||||||||||||||||||||||||
| Bluetooth calling | No | No | ||||||||||||||||||||||||
| Wi-Fi | Yes | Yes | ||||||||||||||||||||||||
| NFC | Yes | Yes | ||||||||||||||||||||||||
| GPS | GPS/GLONASS/Galileo | GPS/GLONASS/Galileo | ||||||||||||||||||||||||
CELLULAR TECHNOLOGY |
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| Technology | No | No | ||||||||||||||||||||||||
| SIM | No | No | ||||||||||||||||||||||||
| Band | No | No | ||||||||||||||||||||||||
NOTIFICATIONS |
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| Email alert | Yes | Yes | ||||||||||||||||||||||||
| SMS alert | Yes | Yes | ||||||||||||||||||||||||
| Calls alert | Yes | Yes | ||||||||||||||||||||||||
| Event reminder | Yes | Yes | ||||||||||||||||||||||||
| Weather | Yes | Yes | ||||||||||||||||||||||||
| Third-party apps | Yes | Yes | ||||||||||||||||||||||||
FITNESS TRACKING |
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| Sleep apnea | No | No | ||||||||||||||||||||||||
| Sleep tracking | Yes | Yes | ||||||||||||||||||||||||
| Steps | Yes | Yes | ||||||||||||||||||||||||
| Floors climbed | Yes | Yes | ||||||||||||||||||||||||
| Heart rate monitoring | Yes | Yes | ||||||||||||||||||||||||
| Calories | Yes | Yes | ||||||||||||||||||||||||
| Distance | Yes | Yes | ||||||||||||||||||||||||
| Stress | Yes | Yes | ||||||||||||||||||||||||
| VO2 Max. | Yes | Yes | ||||||||||||||||||||||||
| Blood oxygen | No | No | ||||||||||||||||||||||||
| Blood pressure | No | No | ||||||||||||||||||||||||
| Menstrual cycle tracking | Yes | Yes | ||||||||||||||||||||||||
| Swim tracking | Yes | Yes | ||||||||||||||||||||||||
| Under-water heart rate tracking | No | No | ||||||||||||||||||||||||
| Preloaded maps | No | No | ||||||||||||||||||||||||
| On-screen workout modes | No | No | ||||||||||||||||||||||||
| Triathlon mode | Yes | Yes | ||||||||||||||||||||||||
| ECG Tracking | No | No | ||||||||||||||||||||||||
| Preloaded sport modes | Yes | Yes | ||||||||||||||||||||||||
| Safety tracking | Yes | Yes | ||||||||||||||||||||||||
MEDIA |
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| Audio | No | mp3/mp4 | ||||||||||||||||||||||||
| Music streaming | No | Yes | ||||||||||||||||||||||||
| Bluetooth music | No | Yes | ||||||||||||||||||||||||
| Radio | No | No | ||||||||||||||||||||||||
| Loudspeaker | No | No | ||||||||||||||||||||||||
| Microphone | No | No | ||||||||||||||||||||||||
| Camera | No | No | ||||||||||||||||||||||||
SENSORS |
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| Accelerometer | Yes | Yes | ||||||||||||||||||||||||
| Barometer/Altimeter | Yes | Yes | ||||||||||||||||||||||||
| Heart rate monitor (HRM) | Yes | Yes | ||||||||||||||||||||||||
| Compass | Yes | Yes | ||||||||||||||||||||||||
| Gyroscope | Yes | Yes | ||||||||||||||||||||||||
| Ambient light | __ | __ | ||||||||||||||||||||||||
| Pulse Oximeter | No | No | ||||||||||||||||||||||||
| ECG | No | No | ||||||||||||||||||||||||
| Thermometer | Yes | Yes | ||||||||||||||||||||||||
| Other sensors | -- | -- | ||||||||||||||||||||||||
PLATFORM |
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| Operating system (OS) | Proprietary OS | Proprietary OS | ||||||||||||||||||||||||
| Chipset | -- | -- | ||||||||||||||||||||||||
| CPU | -- | -- | ||||||||||||||||||||||||
| GPU | -- | -- | ||||||||||||||||||||||||
BATTERY |
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| Type of battery | Non-removable Li-ion battery | Non-removable Li-ion battery | ||||||||||||||||||||||||
| Battery capacity | -- | -- | ||||||||||||||||||||||||
| Battery life | Smartwatch Mode: Up to 7 days GPS mode: Up to 14 hours | Smartwatch Mode: Up to 7 days GPS mode with music: Up to 5 hours GPS mode without music: Up to 14 hours |
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| Charging type | USB charging cable | USB charging cable | ||||||||||||||||||||||||
| Charging time | About 1-2 hours | About 1-2 hours | ||||||||||||||||||||||||
| Battery saver mode | No | No | ||||||||||||||||||||||||
| Solar power | No | No | ||||||||||||||||||||||||
| Rapid charging | No | No | ||||||||||||||||||||||||
CLOCK FEATURES |
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| Time/Date | Yes | Yes | ||||||||||||||||||||||||
| Stopwatch | Yes | Yes | ||||||||||||||||||||||||
| Alarm | Yes | Yes | ||||||||||||||||||||||||
OTHER FUNCTIONS |
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| Control camera | Yes | Yes | ||||||||||||||||||||||||
| Music control | Yes | Yes | ||||||||||||||||||||||||
| Find phone | Yes | Yes | ||||||||||||||||||||||||
| Text response | Yes (android only) | Yes (android only) | ||||||||||||||||||||||||
MISC |
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| Payment system | Garmin Pay | Garmin Pay | ||||||||||||||||||||||||
| Compatibility | Android and iOS Check if your device is compatible | Android and iOS Check if your device is compatible |
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| Companion app | Garmin connect IQ store | Garmin connect IQ store | ||||||||||||||||||||||||
| Customizable watch face | Yes | Yes | ||||||||||||||||||||||||
| Interchangeable band | Yes, 20mm | Yes, 20mm | ||||||||||||||||||||||||
| Voice command | No | No | ||||||||||||||||||||||||
BOX CONTENTS |
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| Garmin Forerunner 645 | Garmin Forerunner 645 Music | |||||||||||||||||||||||||
| Straps | Straps | |||||||||||||||||||||||||
| USB charging cable | USB charging cable | |||||||||||||||||||||||||
| Quick start guide | Quick start guide | |||||||||||||||||||||||||
| NOTE: We can't guarantee that all the information on this table are 100% correct. Read full disclaimer. Please, report an error. | ||||||||||||||||||||||||||
| Official Site | Official Site | |||||||||||||||||||||||||
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(READ ALSO
Garmin Forerunner 645/645
- Design
- Long Battery Life
- Waterproof Rating
- Activity/Fitness Tracking
- Media
- Notifications
The Forerunner 645 is housed in a decent circular shape made of some of the most durable materials. It has a stainless steel bezel that does make it look classic and decent enough to grace your wrist even for high profile occasions.
The sunlight visible transflective Memory-in-pixel display is not the most interactive display, but it’s certainly a lot easier to view outdoors. Something, those who engage in outdoor sport will appreciate especially when in the heat of the sun.
The sizes are moderate too which means this is one watch that will be a nice fit for a lot of people, while the watch face is customizable. Just in case you don’t like it, you can simple download one of your choice from the Garmin connect store where they have some really nice watch faces.
One nice attribute of the Forerunner 645 is the quite impressive battery life that will see you go longer on a single charge with this device. On smartwatch mode, it’s about 4-7 days long battery life while with GPS active, you should expect about 10 hours of battery life.
No doubt impressive, and a great deal for runners who engage in longer durational activities.
The Forerunner 645 is rated 5ATM which means it water-resistant up to 50 meters. So it’s swim-proof and with the swim-tracking features such as stroke count, pace, calories and swim efficiency (SWOLF), it’s a great choice for swimmers who like to monitor their performance while swimming.
As a fitness smartwatch, the Forerunner 645 comes with all the standard sensors you’d expect to find in a fitness tracker.
It includes the heart rate monitor, inbuilt GPS with support for the multi-satellite system, altimeter, and accelerometer which accounts for the 645 huge fitness tracking features and support for automatic tracking of a number of sport modes.
The Forerunner 645 and 645 Music are the two models released under the 645 series. While the standard 645 model lacks onboard music storage, the 645 Music has enough onboard storage to contain over 500 music tracks.
You can download and as well stream your favorite tracks from Spotify to the 645 which you can listen to on the go via a Bluetooth enabled earbud.
This is one nice feature that comes handy in helping stay remain on focus, avoiding unnecessary distractions.
With Wi-Fi and Bluetooth available, the Forerunner 645 is able to keep you connected to all that matters to you. It’s compatible with both Android and iOS devices which when successfully connected to a compatible device, syncs emails, incoming calls and other notifications alerts from both third-party and native applications to the watch.
The Forerunner 645 also features an NFC that supports Garmin Pay which lets you make payment directly from the watch.
Pros
- A decent looking smartwatch.
- It is swim-proof.
- A great choice for comprehensive activity tracking.
- NFC and music storage available.
- Impressive battery life.
- Lightweight design.
Cons
- Not touchscreen.
- A bit pricey.
Hi! I’m Jude, the creator and chief editor at Smartwatchseries.com
I’m a scientist, a 3D artist, and a passionate fitness enthusiast. On here, I and other smartwatch fans work hard to help you find the right smartwatch for you with our guides, reviews, and comparisons.
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