Features: RS232 system communication serial port optic isolation product Suitable for terminal devices using 3 wire system (TXD, RXD and GND), such as modem, router, multi-user system and satellite receiver Protects against the effects of electrostatic discharge, faulty wiring and lightning Supports RS-232 asynchronous communication standard, direct insertion into RS-232 interface, convenient operation DB-9 male/female genders are reversible with included thumbscrews for added convenience Helps protect your COMM PORT when connecting to unknown or potentially faulty devices This RS232 Optic Electric Isolator is designed to protect the RS232 serial interface at both ends of the device, inhibit static and surge, prevent ground loop and surge damage Connection: 9 pin DTE devices transmit on pin 3 and receive on pin 2 9 pin DCE devices transmit on pin 2 and receive on pin 3 Specifications: Optic electric isolation voltage: Instant 2.5KV rms; Continuous 500V DC Transmission Rate: 300 bps - 57600 bps Power: Port powered, supply from RS232 (one of TXD / DTR / RTS) Quantity: 1 Pc Note: Please allow 0-3mm error due to manual measurement. Please ensure you are comfortable with this before purchasing Due to differences between monitors, the picture may not reflect the actual color of the item. Thank you Package Includes: 1 x RS-232 Optic Electric Isolator