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DFit D21 Smart Watch Heartrate Wristband Bracelet 0.66" 64 * 48 Pixels OLED Touch Screen Text Incoming Call Notification Pedometer Sedentary Reminder NFC for Android 4.3 iOS8.0 or above: Amazon.co.uk: Electronics & Photo
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/cdn.vox-cdn.com/uploads/chorus_asset/file/21928299/dseifert_200930_4217_0013.0.jpg "How to measure heart rate on your smartwatch - The Verge")