Garmin Vivosmart 4
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)
MaterialPolycarbonate lens, aluminium bezel, silicone strap
BatteryLithium battery
Battery lifeUp to 7 days
Water-resistanceUp to 50 metres (5 ATM)
WeightSmall/medium: 20.4 g
Large: 21.5 g
Sensor3 axis-accelerometer, barometric altimeter, heart rate monitor, vibration alert, ambient light sensor, Pulse Ox
Screen size0.26" x 0.70" (6.6 mm x 17.7 mm), 48x128 pixels
Activity tracking 
Calories burnedYes
Heart rate24/7
Stress & recoveryYes
UV exposure
Skin temperature
Galvanic skin response
Hydration level
Calorie intake
Running featuresAccelerometer (calculates distance for indoor workouts, without need for a foot pod), personal records.
Swimming features
Other - Body Battery™ Energy Monitor
- blood oxygen saturation (at night and on-demand)
- automatic rep count in the gym
- Clock, music control, auto goal, move bar
Non-fitness functions 
Smartphone notificationsYes
On-board music storage
Connected pay
Affiliate link*Amazon
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