heart rate sensor on a fit band or smart watch measuring heart rate blood pressure electronics, wearables with sensors, health

abstract concept accessory accuracy activity tracker band blood pressure bracelet cardio closeup detail consumer grade electronic electronics equipment exercise fit fitness gadget gym health care healthcare heart rate isolated white macro shot measurement measuring distance speed modern people one object personal portable running self tracking selftracking sensor small smart device watch wear smartband smartwatch sport technology close wearable wearables wireless workout wristband