Bradychan New Wireless Bluetooth USB Sync Dongle with Fitbit Surge Charging Cable for Fitbit Surge Activity Sleep Trackers (Surge Cable and Bluetooth USB) This usb charging cable is compatible for charging the fitbit surge wireless band. Replacement for lost or damaged cables. Plug into USB port. The bluetooth USB sync dongle is compatible with Fitbit surge tracker Note:the devices are not supported on OS X 10.5 and Windows XP. Download the Fitbit app for iOS, Android, or Windows Phone to set up.Any other problem please check the url link:https://www.fitbit.com/cn/start platform=winxp