Garmin Vivosmart 4Garmin Vivosport
Tech specs 
SizeWidth: 15mm
Depth: 10.5mm
Small/medium: 15 x 10.5 x 197 mm (fits wrists with a circumference of 122-188 mm)
Large: 15 x 10.5 x 223 mm (fits wrists with a circumference of 148-215 mm)
Width: 21.0 mm
Thickness: 10.9 mm
MaterialPolycarbonate lens, aluminium bezel, silicone strapCase material: fiber-reinforced polymer
Lens material: chemically strengthened glass
BatteryLithium batteryRechargeable lithium-ion
Battery lifeUp to 7 daysGPS mode: Up to 8 hours
Smartwatch mode: Up to 7 days
Water-resistanceUp to 50 metres (5 ATM)Swim
WeightSmall/medium: 16.5 g
Large: 17.1 g
Small/medium: 24.1 g
Large: 27.0 g
Sensor3 axis-accelerometer, barometric altimeter, heart rate monitor, vibration alert, ambient light sensor, Pulse OxGPS, barometric altimeter, compass, accelerometer, heart rate
DisplayOLEDsunlight-visible, transflective memory-in-pixel (MIP), 72 x 144 pixels
Screen size0.26" x 0.70" (6.6 mm x 17.7 mm), 48x128 pixels9.7 mm x 19.3 mm
ColorsVariousSlate, Limelight, Fuchsia Focus
OtherMEMORY: 7 timed activities, 14 days of activity tracking data
Activity tracking 
Calories burnedYesYes
Heart rate24/7Yes
Stress & recoveryYesYes
Pulse OxYes
Respiration rate
UV exposure
Skin temperature
Galvanic skin response
Hydration level
Calorie intake
GPSConnected GPSYes
Running featuresAccelerometer (calculates distance for indoor workouts, without need for a foot pod), personal records.Preloaded running profiles, GPS based distance/time/pace
Swimming features
Other - Body Battery™ Energy Monitor
- automatic rep count in the gym
- Clock, music control, auto goal, move bar
- all day stress tracking
- gym workout tracking
- music control, find my phone, etc.
- Built in apps for running, cycling, cardio, walking, strength training, rep counting, stair-stepper.
Non-fitness functions 
Smartphone notificationsYesYes
On-board music storage
Connected pay
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