Guantai 1 Channel Video Data Fiber Optical Converter/Converters 1 CH Transmitter/Receiver, FC, Singlemode 20Km, for CCTV Cameras Surveillance Security System Default ship singlemode version (0~20KM), Optional Multimode version(0~2000Meters), Leave message to us after order if need. Automatically compatible for PAL, NTSC, SECAM Video format FC fiber port, Wavelength : Single-mode 1310/1550m (9/125m), Multimode 850m (50/125m), 1310m (62.5/125m) MTBF (Mean time between failure) over 100,000 Hours, Lightning protection With data RS485 reverse direction, available to control PTZ