PCI EXPRESS PCIe RS232 SERIAL 2 PORT CARD with Power  &  Low Profile Bracket  (Support Vista, Win7 )with DC POWER OUTPUT ON PIN 9 of the Serial Port

5V/12V/RI(No Power) Power selectable on each individual port (DB9 Pin9)
The card is specially designed to allow power output from the ninth pin of the connector to enable power up
of the connected devices without power adapter. The card allow user to set each individual port with 5v,12v or RI (No Power)

User can also choose to draw the needed power from the external system power supply.

PCI-e one chip solution(OXFORD OXPCIe952 chip)

It's real COM Port in your computer, not USB to COM port
  high compatible with serial type device.

The adapter card is based on a oxford single chip design, that allows you to harness the full capability of PCI Express (PCIe) - providing optimum reliability and speed, and reducing the load applied to the CPU by as much as 48% over conventional serial cards.

FEATURES

* Fully compliant with PCI Express Base Specification 1.1
*  Provides two DB9 RS232 ports
* High speed 16C950 compatible UART controller on-board
* Supports serial transmission rate up to 460Kbps
* On-chip hardware auto flow control to guarantee no data loss
* Built-in 128K byte DMA software FIFO
* No IRQ resource required
* Easy Plug and Play Installation
* Works with various types of RS232 serial devices including modems,
  PDAs, label printers, bar code scanners, digital cameras, and more
* Supports  Windows® 2000, XP, Server 2003 ,Vista , Win7 ,Win8 and Linux