Energy Pro offers the ultimate choice between strapless and continuous heart rate monitoring When continuous heart rate is needed during full stride or at full pedal, use it with the chest strap To take your heart rate measurement during lighter exercise or at any other time of the day, use it without the strap As a part of the new Smart Touch Series, the MIO Energy Pro integrates the latest in biometric technology into a sports and wellness watch Smart Touch is heart smart; accuracy Visual display of percentage of maximum heart rate 3 default heart rate zone indicators with visual and audib