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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: DSD TECH HC-05 Bluetooth Serial Pass-through Module Wireless Serial Communication with Button for Arduino : Electronics
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Hc-04 Bluetooth-compatible Ble 4.0 Module Wireless Transparent Transmission Serial Port 2.4g Hc-05 Hc-06 Hc-08 Adapter Board - Integrated Circuits - AliExpress
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