INTERCHANGEABLE NUTS & SCREWS: Secure the adapter to serial devices using the pre-installed DB9 nuts, or install the included DB9 screws for compatibility with serial peripheral devices/cables; Add two DB9 RS-232 ports to a computer, using a USB-A port LED INDICATORS: Each port has dedicated Transmit and Receive LED indicators offering real-time monitoring of port activity, while the USB LED indicates when the adapter is successfully recognized by the desktop or laptop COMPATIBILITY: Works with Windows, macOS, ChromeOS, and Linux; Drivers auto-install in Windows 7+, macOS 10.15+, and Linux; COM retention enables the COM port to automatically re-assign if the cable is disconnected/reconnected or if the system is rebooted BUILD QUALITY: One-piece molded TPE housing and Level-4 ESD protection (15kV air/8kV contact) enhance reliability and longevity; Copper shielding minimizes EMI/RFI interference; Gold-plated connectors; Extended operating temperature of -40°C to 80°C TECH SPECS: 2x DB9 RS232 Ports; 1ft (30.5cm) cable length between hub and peripherals (2ft/61cm total product length); FTDI FT2232H Chipset; Max Baud Rate: 921.6Kbps; 4KB FIFO; Odd/Even/Mark/Space/None Parity Modes; 7 or 8 Data Bits; 1 or 2 Stop bits