Usage Scenarios - Suitable for connecting PC computers with industrial-grade RS232 serial and parallel port devices.Port Type:4 Port RS232Serial+1 Parallel PortInterface Type:M.2 (M+B Key)Data Bits:5, 6, 7, 8Stop Bits:1, 2Product Name:M.2 (M+B Key) to4RS-232DB-9Serial Ports and 1 DB-25 Parallel Printer Ports (LPT1) Controller CardModel:10-M2F384-4S1PParity Bit:Even, Odd, Mark, Space, NoneOperating Temperature:-40 to +85Storage Temperature:-55to +125Weight:N/W:365gSystem Compatibility:Supports , Linux and other systemsColour:BlackMaterial:ABSSize:Main Board:22x80mm, Daughter Board:45x67mmPackage Contents:1 * Printer Expansion CardOnly the above package content, other products are not included.Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.