The 3205-3E from Weinschel by Spectrum Control is a RF Variable Attenuator with Frequency DC to 3 GHz, Attenuation Range 1.5 dB, Attenuation Step 0.1 dB, Power 180 W, Insertion Loss 3.75 dB. Tags: Benchtop, Programmable, Digital, USB Controlled, Computer Controlled. More details for 3205-3E can be seen below.