The Fitbit Charge HR Wireless Activity Wristband in Plum, Large, is a top-of-the-line fitness tracker designed for indoor and outdoor activities. With a sleek black design and a comfortable nylon wristband, this activity tracker provides accurate measurements for heart rate, speed, time, distance, and calories. It has a battery life of up to 3 days and is compatible with Windows, iOS, and Android operating systems. The Fitbit Charge HR also features Bluetooth connectivity, multiple sport tracking capabilities, and a variety of useful features such as a clock, alarm, and sleep tracker.