Beurer AS 87 Activity sensor continuously tracks physical activity and monitors quality of sleep Optimum activity monitoring and sleep analysis with free HealthManager app.Transfer: by Bluetooth® low energy technologyNotifications for calls, texts & messages (e.g. WhatsApp & Facebook). Shows content and callerThe Activity sensor continuously tracks physical activity and monitors quality of sleepTransfer: by Bluetooth® low energy technologyActivity tracking:number of steps, distance, calorie consumption, activity duration and achievement of daily activity goalsSleep tracking:tracks sleep movements and sleep durationSelfie function: Easy operation of the smartphone cameraIntegrated search function (smartphone activity sensor)Displays time, date and battery levelMemory capacity: 15 days and 15 nightsAlarm function via vibration alarmWaterproof: 3 ATM