The Fitbit Alta HR Activity Tracker with a Large Band in black color is a wireless device that measures heart rate and provides various features such as GPS, pedometer, calorie monitor, and sleep tracker. It is suitable for indoor and outdoor activities like gym training, yoga, and running. The activity tracker is compatible with iOS and Android operating systems, has a small display size, and a rechargeable battery. The Alta HR model from Fitbit is lightweight and comes with both accelerometer and GPS sensors for accurate tracking of physical activities.
eBay