Specifications
|
Battery type |
Rechargeable, built-in lithium-ion battery |
|---|---|
|
Forerunner® 645 battery life, watch mode |
Up to 7 days with activity tracking, smartphone notifications, and wrist-based heart rate |
|
Forerunner 645 battery life, activity mode |
Up to 14 hr. with GPS and wrist-based heart rate |
|
Forerunner 645 Music battery life, watch mode |
Up to 7 days with activity tracking, smartphone notifications, and wrist-based heart rate |
|
Forerunner 645 Music battery life, watch mode with music |
Up to 8 hr. with activity tracking, smartphone notifications, wrist-based heart rate, and music playback |
|
Forerunner 645 Music battery life, activity mode |
Up to 14 hr. with GPS and wrist-based heart rate |
|
Forerunner 645 Music battery life, activity mode with music |
Up to 5 hr. with GPS, wrist-based heart rate, and music playback |
|
Water rating |
Swim, 5 ATM1 |
|
Forerunner 645 Music media storage |
3.5 GB (approximately 500 songs) |
|
Operating temperature range |
From -20º to 60ºC (from -4º to 140ºF) |
|
Charging temperature range |
From 0º to 45ºC (from 32º to 113ºF) |
|
Forerunner 645 radio frequency/protocol |
2.4 GHz @ 9 dBm nominal
13.56 MHz @ -40 dBm nominal, NFC wireless technology |
|
Forerunner 645 Music radio frequency/protocol |
2.4 GHz @ 8 dBm nominal
13.56 MHz @ -40 dBm nominal, NFC wireless technology |