CSR 4.0 BLUETOOTH ADAPTER PROBLEM SOLVED | Solved That!
USB Stick - Bluetooth dongle Cambridge Silicon Radio Ltd.
Chinese Bluetooth dongle not working (Cambridge Silicon Radio, Ltd Bluetooth Dongle, ID 0a12:0001) : r/linux4noobs
USB Bluetooth-Compatible Adapter V4.0 Dual Mode Wireless Dongle CSR 4.0 USB 2.0 Transmitter Audio Receiver For Windows 10 8 7 - AliExpress
2 Pack USB Bluetooth Adapter CSR 4.0 65 FT for Wireless Headset Dongle, Stereo Headphone, VOIP, Keyboard, Mouse, Support All Windows 10 8.1 8 7 XP Vista : Amazon.in: Computers & Accessories