The Fitbit Charge HR Tracker is a wristband activity tracker designed for fitness enthusiasts. It comes in a small size with a purple color and is compatible with Fitbit Charge HR. The device features heart rate monitoring, sleep tracking, and GPS sensors. It has a small display size with a resolution of 481 x 480 and is powered by batteries with a battery life of up to 3 days. The Fitbit Charge HR Tracker is sold as a unit and comes with a 1-month manufacturer warranty.