Garmin Vivoactive 4/4S
Tech specs 
Size4: 45.1 x 45.1 x 12.8 mm, Fits wrists with a circumference of 135-200 mm
4S: 40.0 x 40.0 x 12.7 mm, Fits wrists with a circumference of 110-175 mm
MaterialCase material: fiber-reinforced polymer with polymer rear cover
Lens material: Corning® Gorilla® Glass 3
Bezel material: stainless steel
BatteryRechargeable lithium-ion
Battery life4: Smartwatch mode: Up to 8 days, GPS mode with music: Up to 6 hours
4S: Smartwatch mode: Up to 7 days, GPS mode with music: Up to 5 hours
Water-resistance5 ATM
Weight4: 50.5 g
4S: 40.0 g
SensorGPS, barometric altimeter, compass, accelerometer, thermometer, heart rate, PulseOx
Displaysunlight-visible, transflective memory-in-pixel (MIP), 260 x 260 pixels (4), 218 x 218 pixels (4S)
Screen size4: 1.3" (33.0 mm) diameter
4S 1.1" (27.9 mm) diameter
Colors4: Silver Stainless Steel Bezel with Shadow Gray Case and Silicone Band; Slate Stainless Steel Bezel with Black Case and Silicone Band
4S: Light Gold Stainless Steel Bezel with Dust Rose Case and Silicone Band; Rose Gold Stainless Steel Bezel with White Case and Silicone Band; Silver Stainless Steel Bezel with Powder Gray Case and Silicone Band; Slate Stainless Steel Bezel with Black Case and Silicone Band.
OtherPLATFORM: Home Grown OS
MEMORY: 7 timed activities, 14 days of activity tracking data
Activity tracking 
Calories burnedYes
Heart rateYes
Stress & recoveryYes
Pulse OxYes
Respiration rateYes
UV exposure
Skin temperature
Galvanic skin response
Hydration level
Calorie intake
Running featuresPreloaded running profiles, GPS based distance/time/pace, run workouts, foot pod capable
Swimming featuresPreloaded swim profiles; Pool swim metrics (lengths, distance, pace, stroke count/rate, calories); Stroke type detection (freestyle, backstroke, breaststroke, butterfly); Pool swim workouts
Swim efficiency (SWOLF)
Other - Body Battery energy monitor
- On-screen workout animations
- gym workout tracking
- music control, find my phone, etc..
- Built in apps for running, golfing, cycling, swimming, snowboarding/skiing, paddle board, rowing, cardio, walking, strength training, rep counting, yoga, eliptical, stair-stepper and more.
Non-fitness functions 
Smartphone notificationsYes
On-board music storageon-device music storage of up to 500 songs
Connected payYes
Affiliate link*Amazon | Garmin
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