The 500-27991 from Quantic Wenzel is a Space Qualified Oscillator with a frequency of 10 MHz and a mass of about 380 gms. It has a warm-up power of about 8 W and a warm-up time of about 20 minutes. This space crystal oscillator has an input power of about 5 W and requires a supply voltage of 15 V. It has a J-STD-001 class 3 soldering, Nickel-plated aluminum housing case, and electroless nickel finish as per MIL-C-26074. ThisMini-USO MIL-PRF-55310-standard compliant oscillator measures 4 x 3 x 1.5 Inches and is ideal for applications such as Precision Timing Reference, Communication Links, Frequency Converters, Radar and Measurement, and Geosynchronous Satellites.