The 8331-M1-XX-XX from Weinschel by Spectrum Control is a RF Variable Attenuator with Frequency 200 MHz to 6 GHz, Attenuation Range 31.5 dB, Power 0.2 W, Insertion Loss 4 dB, Operating Temperature 0 to 50 Degree C. Tags: Rackmount, Programmable, Digital, USB Controlled, Computer Controlled, Multi-Channel. More details for 8331-M1-XX-XX can be seen below.