Tripp Lite U209-006-2 interface cards/adapter

Connects 2 DB9 Devices to a USB-A Device
Recommended for connecting a modem, digital camera, PDA or ISDN terminal to your computer, laptop or tablet
Supports data transfer speeds up to 225 Kbps—twice as fast as a built-in serial port
No external power source required
Portable 6 ft. design fits perfectly into laptop bag
COM retention for automatic reassigning of COM values to ports in case of disconnection or reboot
Integrated FTDI FT232RL chipset

First-Rate Construction for Superior Signal Transfer
Premium foil and braid shielding for EMI/RFI noise protection
Molded nickel-plated connectors with gold-plated contacts for optimal signal quality
Integral strain relief for long life
Flexible PVC jacket easy to install in tight spaces

Broad Compatibility
Compatible with Windows, Mac and Linux operating systems