This product is either discontinued or we cannot get that from suppliers.
Startech MPEX4S552, Port-4, Bus Mini PCI Express, Data Bits 5, 6, 7, 8, FIFO 256 Bytes, Max Baud Rate 921.6 Kbps, Connector 1 - Mini PCI Express x1 (52 pin) Male, External Ports 4 - DB-9 (9 pin, D-Sub) Male, Included 1 - 4 Port Mini-PCIe Serial Card, 4 - DB9 ribbon cable, 1 - Driver CD, 1 - Instruction Manual.
The MPEX4S952 4-Port RS232 Mini PCI Express Serial Card (16650 UART) turns a mini-PCIe slot into four RS232 (DB9) serial ports with data rates up to 921.6 Kbps - a cost-saving solution for adding serial support to embedded systems missing the functionality.