I love my Fitbit versa 2 watch so much that I bought this band as a gift for my little brother who just got into fitness and he is yet to use it lol so I would like to regift to you, dear reader! Unused, download the free Fitbit app to program it with your iPhone (not sure about the android/Samsung specs but I assume they have an app as well). Check out a description on the included Amazon description! Comes with a charger :)