The 8331-C4-XX-XX from Weinschel by Spectrum Control is a RF Variable Attenuator with Frequency DC to 18 GHz, Attenuation Range 110 dB, Power 1 W, Peak Power 80 dBm, Insertion Loss 3.5 dB. Tags: Rackmount, Programmable, Digital, USB Controlled, Computer Controlled, Multi-Channel. More details for 8331-C4-XX-XX can be seen below.