Micro USB Bluetooth CSR 4.0 Adapter Dongle Achieved with CSR8510-High Speed 3mbps Micro Wireless Receiver,Includes CSR Harmony CD Software.Compatible with Windows 8 / Windows 7 (32 and 64bit)/Me/ 2000 / 98 /
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User Manual
USB Bluetooth 4.0 Low Energy Micro Adapter with CSR8510 Controller and CSR Harmony for Windows XP Vista 2003 2008 Win 7, DS-2 - AliExpress
1pcs of ipTIME BT40 Bluetooth 4.0 / BT50 Bluetooth 5.0 CSR Harmony USB Dongle | eBay
Amazon.com: Bluetooth CSR 4.0 USB Dongle Adapter, EKSEN Bluetooth Transmitter of Electronic Signals for Windows 10/8/7/Vista - Plug and Play on Win 8 and Above - White : Electronics