This is a dongle
Why it's called a dongle, I have no clue. This is what plugs in to the USB port on the desktop to sync my fitbit. Normally I would use the app on my phone, however I managed to use ALL my data up already and have to wait until the 3rd of next month. I hate Verizon but that's another story.
So I tried to sync on my computer. It wouldn't work. I go to the help section and got frustrated because I wasn't understanding what it was saying. Finally I figured out I needed to download an app. Only problem was I downloaded the wrong thing. What I needed was Fitbit Connect. OK, got that on the computer now plugged in my dongle and it tells me no dongle. I gave up in frustration. Later that evening I went to use my laptop only to find out my cordless mouse wasn't working. Turns out I took the little USB thingy from the laptop thinking it was the fitbit dongle. AHA!!! I switched the two and now Fitbit Connect says I have a dongle and it synced my tracker.
Friday I go to syn again and now it can't find my tracker. I give up. I have had more trouble with the fitbit syncing. It often takes a long time on the phone app. I don't know if my short fuse can handle going back to the help section again. Since this is the last day of my vacation I'm not going to ruin it by getting frustrated. Syncing will just have to wait some more.