Amazon.com: USB Bluetooth 4.0 V4.0 Version USB Bluetooth Wireless Micro Adapter EDR MINI Dongle Compatible For PC Windows 7 /8/10 Vista XP Stereo Headset NEW (Style 1) : Electronics
Cambridge Silicon CSR 4.0 Bluetooth dongle adapter problem - Support & Help Requests - Ubuntu MATE Community
CSR 4.0 Bluetooth Dongle on Linux : r/AnnePro
USB Stick - Bluetooth dongle Cambridge Silicon Radio Ltd.
Solved >> - Bluetooth usb dongle doesn't work | tonymacx86.com
60824 – [PATCH][regression] Cambridge Silicon Radio, Ltd Bluetooth Dongle unusable