The S/N: 19886680 from Lfiber Optic is a Fiber Optic Isolator with Optical Power 20 W, Isolation 55 dB, Insertion Loss 0.8 to 1.2 dB, Wavelength 1064 nm, 1030 nm, 980 nm, 915 nm, 850 nm, 808 nm, 780 nm, Polarization Dependent Loss 0.2 dB. More details for S/N: 19886680 can be seen below.