The FE-5680A from Morion US is a Rubidium Oscillator with Frequency 10 MHz, Frequency Retrace ±0.05 ppb, Supply Voltage 15 to 18 V, Power Consumption 15 W(Steady), 36 W(Warm-up), Phase Noise -145 to -100 dBc. Tags: Module with Connector. More details for FE-5680A can be seen below.