Wellsmart Cardio Sport+ Armband Wellness Smartwatch Fitness Tracker Pulsuhr für Schwimmen Sauna Dampfbad Herzfrequenz bis 30 m Wasserdicht AOK Plus Bonus Integriert Google Fit: Amazon.de: Sport & Freizeit
E400 Cardiac Blood Glucose Smart Health Watch ECG Watch Men Blood Pressure Heart Rate Body Temperature Waterproof Smart Watch(Black) - Walmart.com
Systematic review finds that cardiac data from smartwatches are potentially less accurate for darker skinned individuals - Hospital Healthcare Europe