READ BEFORE BUYING! Fitbit one activity tracker *Device Only* (Clip, charger and armband not included) Firmware version is 6.46 locked. Fitbit is no longer allowing updates. You won't be able to update the firmware but it may not be an issue, depending on the device you have. (priced accordingly) WILL NOT WORK with iphones Tested using a Pixel 7 and pixel 3A The case is pre-owned but the circuit board and battery are new Color varies : Black or Burgundy Expect more than a week on a charge I have been fixing and selling fitbit ones since 2017 on another platform I have changed the battery in over 3,000 ones...I'm very good at what I do.