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USB TO TTL Serial Port Bluetooth Adapter HC-06 master+CP2102 converter Module | eBay
LYUMO Serial Port Module,RS232 BT Adapter,Serial Port Module BC‑04 Wireless 5V Mini USB RS232 Serial Port Communication For Windows/DOS/ Data Transmission - Walmart.com
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PL2303 Module USB to TTL Interfacing With Pc Tutorial : 7 Steps (with Pictures) - Instructables
USB TO TTL Serial Port Bluetooth Adapter HC-06 master+CP2102 converter Module | eBay
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HC-07 Bluetooth module - Serial RS232 / TTL to UART converter and adapter
HC-07 Bluetooth module - Serial RS232 / TTL to UART converter and adapter
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USB TO TTL Serial Port Bluetooth Adapter HC-06 master+CP2102 converter Module | eBay
Bc-04 For Bluetooth Serial Adapter Board 5v Mini Rs232 Usb For Bluetooth Serial Port Communication Module - Instrument Parts & Accessories - AliExpress
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PL2303 Module USB to TTL Interfacing With Pc Tutorial : 7 Steps (with Pictures) - Instructables