Under Armour UA Band One Size Fits All Black Aluminum PC TPU Imported Your UA Band measures sleep, resting heart rate, steps, and even workout intensity when worn with UA Heart Rate. Wear it ALL THE TIME. Features a display that can stay on during workouts, no need to push buttons Water-resistant so you can wear 24/7. UA Band can be worn when showering, but should not be submerged under water Bluetooth Smart compatible and connects with UA Record Steps & workout data syncs with MapMyFitness & MyFitnessPal