Forerunner 645/645 Music

Yes. The Forerunner 645 Music features 4 GB of internal storage, allowing you to download up to 500 songs directly to the watch. You can then pair it with Bluetooth headphones for a completely phone-free workout.

Yes, it uses Garmin’s Elevate wrist-based heart rate technology to monitor your pulse 24/7. While it is highly accurate for daily activity and steady-state runs, those requiring clinical-grade precision for interval training may still prefer a chest strap.

In GPS mode with music playback enabled, you can expect up to 5 hours of battery life. If you are using it strictly as a smartwatch for notifications and daily tracking, the battery will last up to 7 days on a single charge.

Yes, the watch has a 5 ATM water resistance rating, meaning it can withstand pressures equivalent to a depth of 50 meters. It is safe to wear while swimming, showering, or running in the rain.

Garmin Pay works with many major credit and debit cards, but compatibility depends on your specific bank. You should check the Garmin Pay bank compatibility list on their website to confirm your card issuer is supported before relying on this feature.

The watch tracks advanced running dynamics, such as cadence, stride length, and ground contact time, when paired with a compatible accessory. It also provides performance monitoring tools that analyze your recent exercise history to tell you if you are training productively, peaking, or overreaching.