What is this bit of kit?

[Goodolpete]

I found this on my tv cabinet shelf next to my zgemma, and have no idea what it is. No markings at all.

 

[manic01]

Wifi adaptor

 

[ronaldbiggs]

Yep I have one of those for a wireless mouse

 

[Aristotle]

I have a few that came with 2.4GHZ dongle remotes.

 

[smiffy46]

As said -- bluetooth dongle