The 501-25404 from Quantic Wenzel (Wenzel Associates, Inc.) is a OCXO with Frequency 6000 MHz, Supply Voltage 15 V, Phase Noise -91 dBm/Hz@100 Hz to -61 dBm/Hz@10 Hz, Phase Noise 1 kHz -118 dBm/Hz, Phase Noise 10 kHz -136 dBm/Hz. Tags: Module with Connectors. More details for 501-25404 can be seen below.