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nRF52840 USB Key with TinyUF2 Bootloader - Bluetooth Low Energy [MDBT50Q-RX] : ID 5199 : $15.95 : Adafruit Industries, Unique & fun DIY electronics and kits
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Bluetooth V4.0 Class II BT 4 Class 2 Tiny Nano USB Adapter 2.4 GHz For BT Device 5901969412161 | eBay
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