The TWX371 Serial from Techniwave is a RF Variable Attenuator with Frequency DC to 18 GHz, Attenuation Range 11 to 110 dB, Attenuation Step 1 to 10 dB, Power 1 W, Insertion Loss 0.6 dB. Tags: Module with Connectors, Programmable. More details for TWX371 Serial can be seen below.