The BSD1004A from Advanced Microwave Inc is a RF Detector with Frequency 4 to 8 GHz, TSS -52 dBm, Frequency Flatness 0.6 ±dB, Voltage Sensitivity 1600 mV/mW, Capacitance 20 pF. Tags: Module with Connectors, Diode Detector. More details for BSD1004A can be seen below.