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Great extender band for Fitbit Flex/2, Fitbit Alta/HR, Fitbit Ace, Fitbit Inspire HR watch band and perfect fit. Use as simply as the way like you wearing wristband - just simply keep the buckle locking the extender on one end and the extender buckle the band on other end, then you "create" a larger wristband! Connecting with our extender band, you can easily extend the wristband from small size to large size even x-large size, if you like, you can also put the wristband on your ankle and you are able to get more accurate steps when cycling, running on a treadmill, or pushing a grocery cart, etc.