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Device Information 43
Battery type 620 mAh prismatic, lithium-
ion battery
Battery life Actual battery life depends
on use of GPS, backlight,
and ANT+ devices. With a
fully charged battery, the
Forerunner can operate up
to 20 hours with GPS on.
Water
resistance
Water resistant to 164 ft.
(50 m)
Operating
temperature
range
From -4°F to 140°F
(from -20°C to 60°C)
Radio
frequency/
protocol
2.4 GHz ANT+ wireless
communications protocol
Battery type User-replaceable CR2032, 3
volts (page 44)
Battery life Approximately 4.5 years
(1 hour per day)
Water
resistance
98.4 ft. (30 m)
This product does not
transmit heart rate data
to your GPS device while
swimming.
Operating
temperature
From 23°F to 122°F
(from -5°C to 50°C)
: In cold conditions,
wear appropriate clothing to
keep the heart rate monitor
near your body temperature.
Radio
frequency/
protocol
2.4 GHz ANT+ wireless
communications protocol
Power source USB
Operating
temperature
From 14°F to 122°F
(from -10°C to 50°C)
Radio
frequency/
protocol
2.4 GHz ANT+ wireless
communications protocol
Transmission
range
Approximately
16.4 ft. (5 m)