I have a Xircom 4-port USB hub. The model # is PGHub4. It's about 4 x 4 x 1. Small thing. Powered by a wall wart. Blue in color, little rubber feet on the bottom to keep it from sliding all over. Four LEDs on the front. One for each port. When a device is plugged into the port and powered on, the LED for that port is green. When the port is empty or the device attached to it is off, the LED is red. Simple.
I don't use it too often, but when I do it works great.