Withings ScanWatch
Tech specs 
Size38 mm diameter with three watch hands
Material
ChargingNo
Battery Coin cell battery
Battery life
Water-resistanceUp to 50 m (5 ATM)
Weight
Sensor Accelerometer, combined heart rate and SpO2 sensor, 3 electrodes, and an altimeter
DisplayHybrid with small PMOLED display
Screen size36.3 mm diameter
ColorsMultiple
Other
Activity tracking 
StepsYes
DistanceYes
Calories burnedYes
ActivityYes
FloorsYes
SleepYes
Heart rateYes
Stress & recovery
Pulse OxYes
Respiration rate
UV exposure
Skin temperature
Galvanic skin response
Hydration level
Calorie intake
GPSConnected GPS (distance, pace & elevation)
Running features
Swimming features
Other Instant ECG on demand
Delivers heart health notifications when heart rate is atypical (too low or high) and if irregular rhythms are detected.
Monitors oxygen saturation during the night and identifies Apneic episodes
Non-fitness functions 
Smartphone notificationsYes
On-board music storage
Connected pay
LTE
Links 
Affiliate link*Withings
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