The AC118A-90-21 from Weinschel by Spectrum Control is a RF Variable Attenuator with Frequency DC to 4 GHz, Attenuation Range 0 to 90 dB, Attenuation Step 10 dB, Power 2 W, Peak Power 53.01 dBm. Tags: Module with Connectors, Rotary. More details for AC118A-90-21 can be seen below.