The ATT-64E from Becker Nachrichtentechnik GmbH is a RF Variable Attenuator with Frequency 0.05 MHz to 8.5 GHz, Attenuation Range 0 to 31.75 dB, Attenuation Step 0.25 dB, Attenuation Accuracy ±0.10 to ±2.75 dB, Power 0.01 to 0.5 W. Tags: Rackmount, Programmable, USB Controlled. More details for ATT-64E can be seen below.