SF Cable 6 ft USB 2.0 to Serial 9-pin DB9 RS-232 Adapter Cable with Thumbscrews Designed for connections to cellular phones, PDAs, digital cameras, modems, or ISDN terminal adapters through your USB port Simply plug your device into the adapter and the adapter into your PC or Mac Supports automatic handshake mode. No IRQs, no IRQ conflicts Utilizes the FTDI chipset; plug and play, driverless installation. Lifetime Warranty