The HG153S from Microarray Technologies Corporation is a RF Variable Attenuator with Frequency 500 MHz to 4 GHz, Attenuation Range 15.5 dB, Attenuation Accuracy -0.5 to 1.5 dB, Power 0.5 W, Insertion Loss 2 dB. Tags: Surface Mount, Digital, Voltage Controlled. More details for HG153S can be seen below.