This USB A to RS232 serial adapter cable is designed for DB9 port to computer USB-A port connection and is ideal for A variety of device setups with RS232 to USB.. This USB to D-SUB 9 Pin cable adopts integrated injection molding for more stable signal transmission and better compatibility. Tinned copper conductor and multi-layer shielding against electromagnetic interference, ensure high-speed data transmission, data transmission without delay.. USB and DB9 connectors are gold-plated, reliable and stable connection, wire as a high-quality PVC outer cover, soft and wear-resistant, equipped with dustproof cap, dustproof and moisture-proof to facilitate long-term storage of wire.