July 2nd 2018 Verified user
I bought this for a car radio unit. I also tried another small metal cased stick, which had a keyring hole, the extra space for the hole meant when I detached the radio face plate (USB stick still installed) it wasn't able to fit into the protective cover without removing the stick.
With this USB stick I can just leave it in the radio permanently, as when the faceplate is removed the protective case closes perfectly. 16GB is plenty of space to store all the music needed for any journey too. Black colour is also subtle when installed so you don't even notice it's there.