Elevate your fitness routine with this cutting-edge heart rate monitor featuring a rechargeable lithium battery and a convenient LED charging indicator, ensuring you're always ready to go. Seamlessly sync your data with the Echelon Fit App to track progress in real time. The innovative HR Zone Light changes color based on your heart rate, providing instant visual feedback to keep you motivated and in the optimal training zone. Compatible with iPhones 4s and later, as well as Android devices supporting Bluetooth 4, it offers versatile connectivity. With a powerful Bluetooth Smart Technology, enjoy a maximum range of 32.8 feet, giving you the freedom to move without limits. Perfect for athletes and fitness enthusiasts seeking accuracy, comfort, and convenience in one sleek device.