To my absolute surprise, the Sitecom CN-502 USB Bluetooth Dongle works perfectly with out-of-the-box Fedora Core 4 x86_64. The lsusb output shows it’s a Cambridge Silicon Radio chip (0a12:0001) which is very widely used and well supported. I bought this thing some time ago because of its protruding aerial; my original intention was to dismantle it and add a huge-gain antenna – Car Whisperer-esque - but I just haven't got around to doing it. The lsusb output: Bus 003 Device 002: ID 0a12:0001 Cambridge Silicon Radio, Ltd Bluetooth Dongle (HCI mode) For completeness, here is the rest of my config: $ uname -a Linux localhost 2.6.14-1.1656_FC4 #1 Thu Jan 5 22:13:55 EST 2006 x86_64 x86_64 x86_64 GNU/Linux $ rpm -q -a | grep -i bluez bluez-hcidump-1.18-1 bluez-utils-2.15-7 bluez-pin-0.24-2 bluez-libs-2.15-1 And it working: $ /etc/init.d/bluetooth start Starting Bluetooth services: [ OK ] $ hcitool scan Scanning ... 00:XX:XX:XX:XX:XX XXXXXXXX Not bad since I found it in a bargain bucket! Related Links: Sitecom CN-502 Product Support