Come and see our amazing products. See the quality of each night's sleep by measuring heart rate, time asleep, time awake, time in deep and REM sleep and restlessness.Use 24/7 heart rate tracking to better track calorie burn, optimise effort during workouts, see your resting heart rate trends and cardio fitness level in the Fitbit app. Pls confirm with us about the packing info, stock color and exact production time before placing your order.