Is bluetooth 4.0 backwards compatible with bluetooth 2.0+EDR? - Super User
Bluetooth Compatibility | Makeblock Education
The differences between BLE 4.0, BLE 4.1, BLE 4.2, and BLE 5.
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BLE 4.1 vs. BLE 4.2 - New Features and Advantages | Symmetry Electronics
High Performance Bluetooth 4.0 Adapter, Wireless Bluetooth CSR 4.0 Dongle Adapter Compatible with Windows 10, 8.1 / 8, 7, Vista, XP, 32/64 Bit and Classic Bluetooth, Stereo Headset Compatible - Newegg.com
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Bluetooth 5.0 vs 4.0 - Comparative Analysis Guide | Intuz
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Bluetooth 5.0 USB Adapter Micro Dongle 66ft/20m Compatible with Windows 10,8.1/8,7,Vista, XP, 32/64 Bit for Desktop , Laptop - Walmart.com