Make every beat count with Charge HR— an advanced tracking wristband that gives you automatic, continuous heart rate and activity tracking right on your wrist – all day, during workouts and beyond. See heart rate 24/7 to get more accurate all-day calorie burn, reach your target workout intensity, maximize training with simplified zones and get all day health insights. See all the best stats like steps, distance, floors climbed and sleep quality to make the most of your day. Stay connected with Caller ID and wireless sync to your smart phone and computer to monitor trends. Get the motivation you need to push yourself further — every step, every beat, every day. estimated ship dimensions: 8.7 inches length x 3.0 inches width x 2.7 inches height estimated ship weight: 0.325 pounds Material: Rubber Dimensions (Overall): 7.0 centimeter (L) x 7.0 centimeter (W) Weight: .1 kilograms MP3 Player Type: Fitbit Charge Computer Features: Daily alarms, water resistant Includes: Instructions Battery Charge Life: Up to 5 days Wireless Technology: Bluetooth Connectivity: USB Operating System Compatibility: Android, Apple iOS Activities tracked: Calories Burned, Trip Time, Trip Distance, Total Steps, sleep quality, sleep interruptions, Sleep Duration, route, Heart Rate, Daily Distance, Continuous Heart Rate Battery: 1 Lithium ion, Required, included Warranty: 1 year limited warranty. To obtain a copy of the manufacturer’s warranty for this item, please call Target Guest Services at 1-800-591-3869.