Quantic PMI Model No. PVA-500M18G-60-SFF is a Variable Attenuator that operates over the 0.5 to 18.0 GHz frequency range. This model has an insertion loss of 4 dB, a VSWR of 1.8:1, an attenuation flatness of ±3.5 dB, an attenuation accuracy 0.86 dB, and a rise and fall time of 2 us. Unit size is 2.00" x 1.81" x 0.50" and has SMA female connectors. https://www.pmi-rf.com/product-details/pva-500m18g-60-sff