Fitbit Bluetooth USB Wireless Synchronized Fitbit USB Dongle for Fitbit Alta/Blaze/Charge/Charge HR//Charge 2/Surge/Flex/One/Force Activity Monitor Trackers 1. A replacement for the fitbit cable; bluetooth USB, synchronize Fitbit data wirelessly. 2. Compatible with Fitbit Charge 2, One, Flex, Force, Charge, Charge HR, Surge, Blaze, Alta activity trackers. (Please note that this item does NOT FIT for fitbit ZIP model.) 3. NOTE: It does NOT work for FITBIT ZIP MODEL, please pay attention to it before you are buying. 4. Note: The best syncing distance between the fitbit tracker and dongle is within 1m(3.3 feet) . 5. Ideal for second laptop or computer, easy to carry around