The Nike+ Fuelband (1st Gen) WM0105-001-S Black Bluetooth Fitness Activity Tracker is a small, sleek device designed for both indoor and outdoor activities. With features such as Bluetooth connectivity, alarm, smartphone compatibility, and average heart rate tracking, this activity tracker is perfect for gym and training sessions. This unisex adults' fitness technology from Nike is equipped with GPS sensors for accurate tracking and operates on batteries for convenience. The black color and English language make it versatile for users looking to monitor their fitness progress in style.