Zero delay automatic transmission. Built-in static and surge protection up to 600W 3 feet (1 meter) cable. RS232 output power: -5.7 to +5.7VDC. USB 1.1 and 2.0 compliant Automatic send data control. Auto detection of data speed Indication LEDs for Power, TX and RX. No power supply needed, plug and play Supported OS platforms are Windows 7, 8 and 10 as well as Linux and MacOS 10.X