The ANO 51-0503-20 from ANOISON Electronics LLC is a Fixed Attenuator with Frequency DC to 18 GHz, Attenuation 20 dB, Power 5 W, Peak Power 50 W, Attenuation Accuracy -0.3 to 0.5 dB. Tags: Module with Connectors. More details for ANO 51-0503-20 can be seen below.