Ubuntu: How to setup a Cambridge Silicon Radio, Ltd Bluetooth Dongle (HCI mode)? - YouTube
USB Stick - Bluetooth dongle Cambridge Silicon Radio Ltd.
CSR plc - Wikipedia
CSR 4.0 Harmony : Cambridge Silicon Radio : Free Download, Borrow, and Streaming : Internet Archive
ZHIYUEN® Mini Bluetooth CSR 4.0 USB Bluetooth Adapter Dongle Wireless Receiver for Windows 10/8/7/Vista/XP Supports Mouse Keyboard Headphone : Amazon.com.au: Electronics
Bluetooth on Ubuntu 13.10 Sony Vaio- Can I manage multiple USB bluetooth adapters? - Ask Ubuntu