Fitbit Wireless HR Sync - DongleKeep this little device plugged into the USB port on your computer, so you can wirelessly sync your Fitbit tracker and see how every step adds up. Syncing Works with all Fitbit trackers. The dongle may be refurbished. Our refurbished dongles are tested to ensure they look and work like new. Computers running Windows 7, 8 or 8. 1 operating systems require a dongle in order to sync to your computer. All other computers or tablets running Windows 10 or