The 501-25406 from Wenzel Associates is a OCXO with Frequency 7000 MHz, Supply Voltage 15 V, Phase Noise -87 dBm/Hz@100 Hz to -57 dBm/Hz@10 Hz, Phase Noise 1 kHz -113 dBm/Hz, Phase Noise 10 kHz -131 dBm/Hz. Tags: Module with Connectors, OCXO. More details for 501-25406 can be seen below.