The 8331-K1-XX-XX from Weinschel by Spectrum Control is a RF Variable Attenuator with Frequency 10 MHz to 2.5 GHz, Attenuation Range 63.75 dB, Power 1 W, Insertion Loss 10 dB, Operating Temperature 0 to 50 Degree C. Tags: Rackmount, Programmable, Digital, USB Controlled, Computer Controlled, Multi-Channel. More details for 8331-K1-XX-XX can be seen below.