Guantai 8 Channel Video Fiber Optical Converter 1 Pair Transmitter and Receiver with FC and RS485 Data Up to 20Km for CCTV Cameras Security System Video format compatible for PAL, NTSC, SECAM Default ship singlemode version (0~20KM), Optional Multimode version(0~500Meters), Leave message to us after order if need. 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 RS485 data reverse direction, available to control PTZ