The ANO 21-2001-04 from ANOISON Electronics LLC is a Fixed Attenuator with Frequency DC to 26.5 GHz, Attenuation 4 dB, Power 20 W, Peak Power 300 W, Attenuation Accuracy +0.7/-0.5 dB. Tags: Module with Connectors. More details for ANO 21-2001-04 can be seen below.