The ZD-8-X from MCLI is a RF Detector with Frequency 1 to 4 GHz, Max Input Power 23.01 dBm, Frequency Flatness ±0.3 dB, Voltage Sensitivity 500 mV/mW, VSWR 1.30:1. Tags: Module with Connectors, Diode Detector. More details for ZD-8-X can be seen below.