The ZSD-1840 from Advanced Microwave Inc is a RF Detector with Frequency 18 to 40 GHz, Max Input Power -10 to 30 dBm, TSS -45 dBm, Frequency Flatness 1 dB, Voltage Sensitivity 400 mV/mW. Tags: Module with Connectors, Diode Detector. More details for ZSD-1840 can be seen below.