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DSD TEcH SH-B23A Bluetooth 20 to RS232 Serial Adapter with DB9 converterThe SH-B23A RS232 Bluetooth adapter was designed and manufactured by the DSD TEcH team Before releasing this BT RS232 adapter, DSD TEcH team had more than 4 years of experience in manufacturing Bluetooth products If you have any suggestions for this product, please feel free to..