The 8331-B3-XX-XX from Weinschel by Spectrum Control is a RF Variable Attenuator with Frequency DC to 6 GHz, Attenuation Range 70 dB, Power 1 W, Peak Power 76.99 dBm, Insertion Loss 3.5 dB. Tags: Rackmount, Programmable, Digital, USB Controlled, Computer Controlled, Multi-Channel. More details for 8331-B3-XX-XX can be seen below.