DisplayPort or HDMI dual-head 4K transmission up to 30 km over singlemode cable Supports DisplayPort and HDMI video up to 3840 x 2160 at 30 Hz Transparent USB 2.0 extension supports HID devices, mass storage devices. Bidirectional audio via speaker/mic connection Supports RS-232 peripheral (serial) devices such as scanners or terminals. Local and remote units connect at distances of up to 10 km using SFP