Guantai 8 Channels Video Fiber Optical Media Converters (1Pair Transmitter & Receiver) Singlemode Fiber Up to 20Km for CCTV Cameras Surveillance Security System Default ship singlemode version (0~20KM), Optional Multimode version(0~1000Meters), Leave message to us after order if need. Automatically compatible for PAL, NTSC, SECAM Video format 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