This device can record distance and heart rate during marathons and running. The screen displays when the charging cable is plugged in, but turns off when the cable is removed (possibly requiring a battery replacement). Also, as shown in photos 3 and 4, there is a cut in the wristband. Please understand the condition before purchasing. Fitbit Surge Large size, black, with GPS tracking and heart rate monitoring. - Model Name: Fitbit Surge - Features: GPS tracking, heart rate monitoring - Color: Black - Accessories: Charging cable - Sensors: Heart rate sensor - Display: Digital display Thank you for viewing.