The 501-25396 from Quantic Wenzel (Wenzel Associates, Inc.) is a OCXO with Frequency 900 MHz, Supply Voltage 15 V, Phase Noise -109 dBm/Hz@100 Hz to -79 dBm/Hz@10 Hz, Phase Noise 1 kHz -136 dBm/Hz, Phase Noise 10 kHz -153 dBm/Hz. Tags: Module with Connectors. More details for 501-25396 can be seen below.