The AD-USB4ALF from Adaura Technologies is a RF Variable Attenuator with Frequency 50 KHz to 3 GHz, Attenuation Range 0 to 63 dB, Attenuation Step 1 dB, Power 1 W, P1dB 25 dBm. Tags: Benchtop, Programmable, Digital, USB Controlled, Computer Controlled. More details for AD-USB4ALF can be seen below.