Activity Sensor Fitness Tracker, AS81

Measures activity tracking, steps, distance, calorie consumption, activity duration, the achievement of activity goals, and sleep tracking Optimal tracking using the free Beurer Health Coach app; the device easily synchronizes with your smartphone via Bluetooth so you can track your measurements and see how they look over time XL OLED display so you can easily read the time along with your activity measurements Memory capacity on the device for 30 days and 7 nights Additional features; alarm function, vibration alarm, splash-proof  Product Dimensions : 9.9 x 0.8 x 0.5 inches; 3.53 Ounces Download this product's instruction manual here