The LC-SM Series from Huihong Technologies Limited is a Fiber Optic Attenuator with Attenuation 1 to 30 dB, Operating Temperature -40 to 80 Degree C, Optical Power w 200 mW, Polarization Dependent Loss 0.2 dB, Return Loss 50, dB (SPC), 55 dB (UPC), 65 dB (APC). More details for LC-SM Series can be seen below.