The PSD-4001-25 from Teledyne Microwave Solutions is a RF Detector with Frequency 10 to 4000 MHz, Max Input Power 40 dBm, Max Input Power 0 to 0.01 W, Frequency Flatness ±0.3 to 0.75 dB, Voltage Sensitivity 90 to 125 mV. Tags: Surface Mount, Log Detector. More details for PSD-4001-25 can be seen below.