The GPC-ISO-1300nm Multimode from Laser 2000 is a Fiber Optic Isolator with Insertion Loss 0.5 to 0.6 dB, Isolation 42 dB, Operating Temperature -5 to 70 Degree C, Optical Power 300 mW, Polarization Dependent Loss TDL 0.15dB. More details for GPC-ISO-1300nm Multimode can be seen below.