Particular strengths of the new Jauch-TCXO are:

• With its enormous frequency stability of ± 0.5 ppm and its low temperature hysteresis of 0.6 ppm, the JT21G meets the high requirements of all common navigation systems.
   
• The JT21G can be used in a temperature range from -40°C to 85°C.
   
• For battery-powered applications, Jauch additionally offers the JT21GE. This variant  is equipped with an E/D function to disable the TCXO and switch its output to high impedance. Power consumption is thus reduced from 2 mA in normal operation to just 5.5 µA.

You will find further technical details as well as additional background information in the data sheet.