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Bluetooth 4.0 USB Module (v2.1 Back-Compatible) : ID 1327 : $11.95 : Adafruit Industries, Unique & fun DIY electronics and kits
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Combination WiFi + Bluetooth 4.0 USB Adapter : ID 4827 : $14.95 : Adafruit Industries, Unique & fun DIY electronics and kits
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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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Amazon.com: SABRENT USB Bluetooth 4.0 Micro Adapter for PC [v4.0 Class 2 with Low Energy Technology] (BT UB40) : Electronics
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