The ZSD-218 from Advanced Microwave Inc is a RF Detector with Frequency 0.2 to 18 GHz, Max Input Power -10 to 30 dBm, TSS -48 dBm, Frequency Flatness 0.6 dB, Voltage Sensitivity 500 mV/mW. Tags: Module with Connectors, Diode Detector. More details for ZSD-218 can be seen below.