Garmin Fenix 5S
Tech specs 
Size42.0 x 42.0 x 14.5 mm
MaterialPlastic with silicon band. Also comes in a Sapphire version.
Battery lifeUp to 9 days in smartwatch mode (depending on settings), up to 14 hours in GPS mode, and up to 40 hours in UltraTrac™ battery saver mode
Water-resistance10 ATM
WeightWith silicone band: 2.4 oz (67.0 g)
SensorAccelerometer, optical heart rate sensor, barometric altimeter, electronic compass, GPS, GLONASS
Display218 x 218 pixels; sunlight-visible, always-on, low power, colorful display
Screen size27.94 mm diameter
ColorsSlate Gray, Silver, Champagne - comes with interchangeable bands in various colors.
OtherPLATFORM: Proprietory
MEMORY: 64 MB; available 54 MB
Activity tracking 
Heart rate24/7
Stress & recoveryYes
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 200 hours of activity data
- built in memory: 64 MB; available 54 MB
- hunt/fish calendar, sun moon information, area calculation
- many other features...
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