The ePulse2 is an advanced technology second generation of the world"s first strapless continuous heart rate monitor and calorimeter that now includes an internal rechargeable battery, streamlined design, integrated accelerometer, and a color display, Since the ePulse2 is worn on the forearm and requires no unwieldy chest strap or special watch, it allows the user to accurately and easily track their heart rate, calories burned, elapsed exercise time and target heart rate zones for cardio and fat burning exercise with performance comparable to chest strap monitors, The full color, graphical Organic Light Emitting Diode (OLED) display can be seen in sunlight as well as at night, The ePulse2 is a continuous heart rate monitor and will give you a constant readout from a signal it picks up from your arm SKU: IST002