The ZD-1-X from MCLI is a RF Detector with Frequency 10 MHz to 12.4 GHz, Max Input Power 23.01 dBm, Frequency Flatness ±0.5 dB, Voltage Sensitivity 500 mV/mW, VSWR 1.40:1. Tags: Module with Connectors, Diode Detector. More details for ZD-1-X can be seen below.