The 501-25381 from Quantic Wenzel (Wenzel Associates, Inc.) is a OCXO with Frequency 300 MHz, Supply Voltage 15 V, Phase Noise -119 dBm/Hz@100 Hz to -89 dBm/Hz@10 Hz, Phase Noise 1 kHz -147 dBm/Hz, Phase Noise 10 kHz -164 dBm/Hz. Tags: Module with Connectors. More details for 501-25381 can be seen below.