The 8331-J3-XX-XX from Weinschel by Spectrum Control is a RF Variable Attenuator with Frequency 800 MHz to 3 GHz, Attenuation Range 103 dB, Power 0.25 W, Insertion Loss 6 dB, Operating Temperature 0 to 50 Degree C. Tags: Rackmount, Programmable, Digital, USB Controlled, Computer Controlled, Multi-Channel. More details for 8331-J3-XX-XX can be seen below.