The HRFC-AT11K-A01(61) from HIROSE ELECTRIC CO., LTD. is a Fiber Optic Attenuator with Attenuation 1 dB Min., Operating Temperature -25 to 70 Degree C, Optical Power w 250, Return Loss 40 dB Min., Storage Temperature 1550. More details for HRFC-AT11K-A01(61) can be seen below.