M.2 card. 8 RS232 COM DB9 serial ports for M2 PCIe, M or B+M keys. EXAR 17V358 chipset.

Mounts on the M.2 port slot of PCs (M or B+M), PCIe type (not suitable for SATA M2 ports)
Compatibility:
WINDOWS XP, Vista, Seven, 8, 10, 11, Server 2003/2008/2012, Linux 2.6.27 / 2.6.31 / 2.6.32 / 3.x.x and newer.
M2 card in 2280 format, suitable for slots 2280 and 22110.
Specifications:
CHIPSET EXAR 17v358.
Compatible PCIe 2.0 Gen 1.
Dual simplex link, 2.5 Gbps in each direction.
15 KV ESD protection for all serial ports.
Automatically controls the direction of data flow...automatically distinguishes and controls the direction of data transmission.
Eight independent UART channels.
256-byte TX and RX FIFOs.
Programmable TX and RX trigger levels.
TX/RX FIFO level counters.
Fractional baud rate generator.
Automatic hardware flow control RTS/CTS or DTR/DSR.
Automatic software flow control Xon/Xoff.
UART interface supporting 5, 6, 7 or 8 data bits and 1, 1.5 or 2 stop bits.
Support even/odd/mark/space/none.
Flow control types: none, hardware and xon/xoff.
Extended operating temperature range: -40 to 85?C.