The HG166SD from Microarray Technologies Corporation is a RF Variable Attenuator with Frequency 12 to 18 GHz, Attenuation Range 31.5 dB, Attenuation Accuracy -0.5 to 2.5 dB, Power 0.5 W, Insertion Loss 3.5 dB. Tags: Surface Mount, Digital, Voltage Controlled. More details for HG166SD can be seen below.