Fitbit bluetooth, New Replacement Bluetooth USB Wireless Sync fitbit Dongle Compatible with Fitbit Flex/Force/One/Charge/Surge/Charge HR Activity Trackers 1.100% new and high quality. 2. A replacement for the fitbit cable; bluetooth USB 3. Compatible with Fitbit One, Flex, Force, Charge, Charge HR, Surge activity trackers. Newly upgrate to compatible with Fitbit Blaze and Fitbit Alta.( Note that only within 1 meter can the dongle better sync with your fitbit) 4. please note that this item does NOT FIT for fitbit ZIP model. 5. Plugs into USB port and sync with your fitbit within 100 centimeters.