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USB to RS-232 DB9 Female 9 Pin Null Modem Rollover Serial Adapter Cable for Windows,Linux MAC OS (Null Modem) Null modem 2-TX sold2025 If you connect it withUSB to RS 232 DB9 Female 9 Pin Null Modem Rollover Serial Adapter Cable for Windows,Linux MAC OS (Null Modem) Product Features USB to RS 232 DB9 female 9 Pin null modem rollover serial adapter cable Length: 6ft Chip: CP2102. The USA quality chip ensures stable transmission of signals If you have any problems within 180 days, please contact us.