The 8331-E2-XX-XX from Weinschel by Spectrum Control is a RF Variable Attenuator with Frequency DC to 40 GHz, Attenuation Range 90 dB, Insertion Loss 5 dB, Operating Temperature 0 to 50 Degree C, Storage Temperature -40 to 75 Degree C. Tags: Rackmount, Programmable, Digital, USB Controlled, Computer Controlled, Multi-Channel. More details for 8331-E2-XX-XX can be seen below.