The FA-400-SC-850-50/125-M-5 from OZ Optics Ltd. is a Fiber Optic Attenuator with Wavelength Dependent Loss ±0.1 dB, Attenuation 5 dB, Return Loss >50 dB, Attenuation Tolerance ±0.5 dB, ±0.7 dB, ±1 dB, Operating Wavelength 850 nm. More details for FA-400-SC-850-50/125-M-5 can be seen below.