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When was Bluetooth 2.0 released? - Quora
Is bluetooth 4.0 backwards compatible with bluetooth 2.0+EDR? - Super User
Bluetooth 5.0 vs 4.0 - Comparative Analysis Guide | Intuz
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APRS Network Version TNC Bluetooth 2.0 4.0 Accessory New Dual Mode | eBay
JDY-08 Bluetooth LE Module - Datasheet, Fritzing part - Networking, Protocols, and Devices - Arduino Forum
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BR8041 USB Bluetooth 5.0 Wireless Adapter Dongle for Windows 10 PC Desktop, Laptop, Mouse, Keyboard, Audio, Headset, Speaker - $2.42 - JacobsParts Inc
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Bluetooth 2.0 Module V3 For Arduino - DFRobot
USB Bluetooth Adapter for connecting RS232 devices via Bluetooth
