Quantic PMI Model No. TD-30T-SHS-218-AMP-OPT4G4D5G-40DBM is a Threshold Detector with a frequency range of 4.0 to 4.5 GHz and a fixed threshold level of -39.2 dBm. It has an operating input power level of -35 to -15 dBm, a max input power level of +10 dBm, and a propagation delay of 18 ns. This model's housing measures 2.5" x 2.0" x 0.5" and has SMA female connectors. https://www.pmi-rf.com/product-details/td-30t-shs-218-amp-opt4g4d5g-40dbm