The 501-25499 from Quantic Wenzel (Wenzel Associates, Inc.) is a OCXO with Frequency 100 - 1000 MHz, Supply Voltage 15 V, Phase Noise -112 dBm/Hz@100 Hz to -91 dBm/Hz@10 Hz, Phase Noise 1 kHz -133 dBm/Hz, Phase Noise 10 kHz -154 dBm/Hz. Tags: Module with Connectors. More details for 501-25499 can be seen below.