The HMU-PJAT1K-A00R1(40) 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 200, Return Loss 40 dB Min., Storage Temperature 1620. More details for HMU-PJAT1K-A00R1(40) can be seen below.