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Bluetooth RS232 Serial GRIDBluFly Pair - 110V - U.S./North America - DCE (2 Female) – Grid Connect
Serial Bluetooth Adapter - RS232
LM068-1100 Bluetooth® 5.0 Dual Mode RS232 Serial Adapter (AO)
Amazon.com: Comimark 1Pcs RS232 Bluetooth Serial Adapter Communication Master-Slave Module 5v Mini USB : Electronics
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Long Range 100m Bluetooth 3.0 RS232 Serial Male Adapter with Bluetooth Class 1 External Antenna DB9 Pin for Data Transfer Serial Port Wireless Adapters - Newegg.com
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New Design Serial Bluetooth Adapter Self-powered Passive Rs232 To Bluetooth Data Transmitting Module No Built-in Battery - Integrated Circuits - AliExpress