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Amazon.com: HiLetgo HC-05 Wireless Bluetooth RF Transceiver Master Slave Integrated Bluetooth Module 6 Pin Wireless Serial Port Communication BT Module for Arduino : Electronics
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Amazon.com: Gowoops 5 Sets of 433Mhz RF Transmitter and Receiver Link Kit for Arduino (2pcs/Set) : Electronics
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HiLetgo 315Mhz RF Transmitter and Receiver Module link kit for Arduino/ARM/MCU/Raspberry pi : Electronics - Amazon.com
