. . "heart rate monitor" . . "heart rate Monitor" . "heart monitor" . . "Optical heart sensor" . "Optical Heart Sensor" . "heart rate watch" . . "heart rate" . . . "heart rate monitors" . . "electronic heart monitor" . "Vitality Sensor" . . "Heart-rate monitor" . . "Heart rate monitor" . . . . "Heart Rate Monitor" . . . . "Heart rate sensor" . "Heart rate monitor" . . . "heart rate sensor" .