The ZD-16-X from MCLI is a RF Detector with Frequency 10 MHz to 50 GHz, Max Input Power 23.01 dBm, Frequency Flatness ±1 dB, Voltage Sensitivity 500 mV/mW, VSWR 2.00:1. Tags: Module with Connectors, Diode Detector. More details for ZD-16-X can be seen below.