What is the maximum operating altitude of the Epson viewer?

• The Epson P-4000 has a maximum outdoor operating altitude of 10,000 ft (3,048 m).
  
  Notes:
  • Because temperatures are typically lower at high altitudes, be careful not to use the P-4000 unless the ambient temperature is between 41° and 95° F (5° and 35° C).
  • The non-operating maximum altitude is 40,000 ft (12,192 m).
  • The altitude limitations do not apply when inside the pressurized cabin of an aircraft.