On-Screen workouts. Connected GPS. Store and play 300+ songs. Bluetooth. Receive smartphone notifications. 4+ Day battery. Heart rate tracking. Water resistant to 50 M. 15+ Exercise modes. SmartTrack exercises to Fitbit app. All-Day activity tracking. Female Health - log menstrual cycle. Track light deep and REM sleep. Comes with Large and Small classic wristbands. Small fits wrists 5.5?-7.1? in circumference. Large fits wrists 7.1?-8.7? in circumference. Engraved or Pad Printed!