Very cheap. - Works well with Ubuntu Linux 12:10 in HP mini notebook. - Works well with Raspbmc and Raspbian on the Raspberry Pi Model B (512MB), in particular sufficient for the power supply of the USB Bluetooth dongle to the USB port of the Raspberry Pi (it is not necessary to connect the dongle via a powered USB hub ). The USB dongle is about 5mm from the front USB port. When activity he flashes blue.