New Replacement USB Bluetooth Wireless Sync Dongle Compatible with Fitbit Alta / Blaze / Charge / Charge HR / Surge / Force / Flex / One Activity Trackers 100% new and high quality; Slim compact design Ideal for second laptop or computer and Easy to carry Compatible with Fitbit One, Flex, Force, Charge, Charge HR, Surge, Blaze, Alta, Alta HR activity trackers Plugs into USB port and note that only within 1 meter can the dongle better sync with your fitbit NOTE: It not work for FITBIT ZIP MODEL, please pay attention to it before you are buying