Check the listing for details. Renewed Authentic Fitbit One Tracker/New Battery/Black/Open Box. Color: Black, Condition: New other (see details). Listed at 135.00 USD. This is an absolutely new, never used FitBit One fitness tracker that was professionally renewed: 1. new battery keeps it running for over a week2. it was updated with the latest firmware and all functions including syncing with the app were tested. All original accessories including charger, slipping strap, holder, and instrurtsuction are absolutely new and never been touched. All "New"/"Sealed in the box" Fitbit Ones have dead batteries today due to their age - they are 10 years old. We specialize in repairing electronics and already restored thousands of FitBit One trackers. The battery in this tracker was replaced with a new one using a special equipment. After the repair, the device is fully tested - for keeping the charge, counting steps, floors, calories, etc.Additionally, it has 6.60 firmware to guarantee compatibility with current and future versions of the Fitbit phone application.Unfortunately, Fitbit stopped offering updates for these devices, so the update is failing even if it is shown as available in the app. The label on the back was added to prevent eBay scams and keep track of serial numbers. Fill free to ask any questions!