Garmin Fenix 3 HR
Tech specs 
Size51.5 x 51.5 x 16.0 mm
MaterialPlastic with silicon band. Also comes in a Sapphire and Chronos version.
ChargingYes
Battery300mAh lithium-ion
Battery lifeUp to 40 hours in UltraTrac mode; up to 16 hours in GPS training mode; up to 2 weeks in smartwatch mode (with 24/7 HR monitoring)
Water-resistance10 ATM
Weight86.1 grams
SensorAccelerometer, optical heart rate sensor, barometric altimeter, electronic compass, GPS
Display205 x 148 pixels; transflective MIP color; sapphire lens
Screen size30.4 mm diameter
ColorsGray. Also comes in a Sapphire and Chronos version.
OtherPLATFORM: Proprietary OS
PROCESSOR: Single Core Processor
MEMORY: 32MB
CONNECTIVITY: Bluetooth Smart, ANT+, Wi-Fi
Activity tracking 
StepsYes
DistanceYes
CaloriesYes
ActivityYes
FloorsYes
SleepYes
Heart rate24/7
Vo2MaxYes
Stress & recovery
UV exposure
Skin temperature
Galvanic skin response
GPSGPS and GLONASS enabled
Running featuresvirtual pacer, VO2 max estimate, recovery advisor, race predictor, running dynamics, calculates distance for indoor workouts, personal records, virtual partner/racer
Swimming featureslengths, distance, pace, stroke count/rate, calories; stroke type identification; open water swim metrics; swim workouts
Smartphone notificationsYes
Other - Multi sport
- Music control, find my phone
- Features physiological measurements (stress score, performance condition and lactate threshold)
- Remembers 100 hours of activity data
- built in memory: 32 MB; available 23 MB
- hunt/fish calendar, sun moon information, area calculation
Links 
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Amazon US rating4.3 out of 5 stars
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