The ANO 51-0503-40 from ANOISON Electronics LLC is a Fixed Attenuator with Frequency DC to 18 GHz, Attenuation 40 dB, Power 5 W, Peak Power 50 W, Attenuation Accuracy -0.9 to 1 dB. Tags: Module with Connectors. More details for ANO 51-0503-40 can be seen below.