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nRF51822 Bluetooth Low Energy Module [MDBT40-256RV3] : ID 4076 : Adafruit Industries, Unique & fun DIY electronics and kits
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Amazon.com: Nordic BLE 4.0 nRF51822 Controller Chip Bluetooth Module Small Size 18.5 x 9.1x 2.0mm 5 Pack : Electronics
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Low Power Nrf51822 Wireless 2.4g Wireless Soc Single Chip Ble 4.0 Bluetooth Network Communication Board Module - Integrated Circuits - AliExpress
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