The ZRD20S-3N from ZTS Technologies is a RF Detector with Frequency 10 MHz to 3 GHz, Max Input Power 20 dBm, Voltage Sensitivity 500 mV/mW, VSWR 1.40:1, Operating Temperature -20 to 55 Degree C. Tags: Connectorized, Power Detector. More details for ZRD20S-3N can be seen below.