Features: This M2- to 8 Port RS232 Serial Card is the perfect solution for those needing multiple serial ports on their computer. With PCIe2.0-Gen1compliance and a transmission media of twisted-pair or shielded cable, this card offers- fast- and reliable communication between devices. The EXAR 17v358 chip and 15KV ESD-protection ensure safe and efficient data transmission, making this card a must-have for any professional workspace-. Direction control: Adopt the technology which automatically controls- the data-flow direction、automatically distinguish and control the data-transmission direction. Use this card to connect multiple devices such as printers, scanners, and other peripherals all-in-one place. Specifications: Type: Expansion Card Model: IO-M2F358C-8S Chip: EXAR 17v358 Output interface: 8 RS232 serial ports Motherboard- slot: M2- (B+M Keys) Interface protection-: 15KV ESD-protection for all- serial ports Data bits: 7/8 Stop position: 1/2 Check digit: Even/Add/Mark/Space/None Working temperature: -40 to 85 ℃ Storage temperature: -65 to 150 ℃ System support: Windows-/Linux- Size:approx 80x22mm/3.14x0.86in Package Includes: 1 Set M2-to-8-port RS232 Serial Card with Cables- note: Due to the problems of lighting effects- and shooting angles, there will be certain tolerances in the product, please understand. Please allow 0-1cm error due to the manual measurment.