The QATT from Becker Nachrichtentechnik GmbH is a RF Variable Attenuator with Frequency 0.05 MHz to 4.5 GHz, Attenuation Range 80 to 100 dB, Attenuation Step 0.5 dB, Attenuation Accuracy 0.2 to 15 dB, Power 0.5 W. Tags: Rackmount, Programmable, USB Controlled. More details for QATT can be seen below.