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Bluefruit LE Sniffer - Bluetooth Low Energy (BLE 4.0) - nRF51822 [Firmware Version 2] : ID 2269 : $24.95 : Adafruit Industries, Unique & fun DIY electronics and kits
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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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