Small, pretty and practical.

This is exactly what I wanted.
And it's even smaller than what I thought:
Along 9,2cm, depth 6,8cm, 3,2cm height.
A blue LED lights when connected to the computer.
The four USB ports "receiving" run smoothly.
No need for external power.
Below, presence two very effective anti-slip.
I plug in, of course, my USB key and an unpowered external hard drive (the connection of two external drives without power problem, especially for data transfers from one to the other).
I also plugged my small transmitter to operate my wireless mouse, and it works without any problems.