Audio and video transmitter through SM single-mode fiber optic. Optical fiber distance up to 20 km. Wavelength: 1310/1550 nm. Fiber optic cable and connectors type: FC simplex singlemode. Each module has a female FC fiber connector, a female BNC video connector, a 3 in RS232 / RS485 terminal, a 2-pin audio terminal and a DC jack for power. The video camera or video source connects to the transmitter module.