The M.2 expansion card provides 2 external RS-232 DB9 serial ports. It is compatible with M.2 2280 (59-pin B+M) slots and features two male RS-232 DB9 connectors in standard and low-profile brackets. It uses a PCIe x1 interface (PCIe 2.1) and an UART solution based on the ASIX AX99100 (16C950 compatible). It supports speeds up to 921.6 kbps, multiple flow control/baud rate settings, and drivers for modern versions of Windows. Suitable for connecting scanners, protocol converters, industrial, and IoT serial devices.