Used in excellent condition Fitbit alta HR. NO CHARGER included - Get the power of continuous heart rate in Fitbit's slimmest design yet-all day, during workouts and beyond - With heart rate, you can better measure calorie burn, and use zones (fat burn, cardio, and peak) to find the right workout intensity for your goals - See how working out more can improve your health by comparing your resting heart rate trends to your activity - With sleep stages powered by purpose heart rate, automatically track your time spent in light, deep and REM sleep and take steps toward a better night's rest - Automatically track your steps, distance, calories burned and active minutes with up to 7 days of battery life (varies with use and other factors)