The DZM1857B from Herotek is a RF Detector with Frequency 10 MHz to 12.4 GHz, Max Input Power 23.01 dBm, Frequency Flatness 0.2 to 0.5 dB, Voltage Sensitivity 500 mV/ mW, VSWR 1.20:1, 1.50:1. Tags: Connectorized, Diode Detector. More details for DZM1857B can be seen below.