TECHTOO 4 Port Professional FTDI CHIP USB to RS232 Serial Cable DB9 Serial Adapter Converter 9-Pin Male to Male with Hexnuts HOW IT WORKS: TECHTOO USB to Quad Port RS232 DB9 Serial Adapter is Designed for Connecting to Serial Devices Such As DB9 Equipped Serial Modems, ISDN Terminal Adapters, Digital Cameras, Label Writers, Palm PCs, Barcode Scanners, PDAs etc Through USB port with 1Mbps Data Transfer Rate CONNECTORS: With Standard USB Type A Male to Standard 9-pin DB9 RS-232 Serial MALE Connector with Hexnuts CONDUCTOR & SHIELDING: Tinned Copper Conductor and Triple Shielding Ensure the Best Data Transfer Rate. Powered by USB Port, No External Power Adapter Required. Simple Installation, Plug & Play after One Time Driver Installation ( Product come with a Driver CD ) CHIPSET & SUPPORTED OS: FTDI FTDI232RL Chipset for Widest Possible Stablity and Compatibility with Windows (10/8.1/8/7XP), Mac, Linux, etc. Support Almost All Serial COM Port LIFETIME WARRANTY: USB 2.0 to Serial (9-Pin) DB-9 RS-232 Converter Cable is Backed with Lifetime Warranty and Customer Service Support