Energy Pro offers the ultimate choice between strapless and continuous heart rate monitoring. Need continuous heart rate when in full stride or at full pedal? Use it with a chest strap. Need to take your heart rate measurement during lighter exercise or at any other time of the day? Use it without a strap – simply apply your fingers, or any part of your hand, to the sensors. Energy Pro features advanced biometric "Smart Touch" sensors giving you the ability to get your heart rate on-demand by touching the metal sensors on the watch face with any part of your hand, not just your fingers. Totally personalized and equipped with heart rate zone indicators allowing you to maximize your workouts and/or exercise at safe and effective levels. With Energy Pro now every fitness enthusiast can enjoy the benefits of personalized feedback, with or without a chest strap.